1 package Koha::SearchEngine::Elasticsearch;
3 # Copyright 2015 Catalyst IT
5 # This file is part of Koha.
7 # Koha is free software; you can redistribute it and/or modify it under the
8 # terms of the GNU General Public License as published by the Free Software
9 # Foundation; either version 3 of the License, or (at your option) any later
12 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License along
17 # with Koha; if not, write to the Free Software Foundation, Inc.,
18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 use base qw(Class::Accessor);
25 use Koha::Exceptions::Config;
26 use Koha::SearchFields;
27 use Koha::SearchMarcMaps;
33 use Search::Elasticsearch;
37 use List::Util qw( sum0 reduce );
40 use Encode qw(encode);
43 __PACKAGE__->mk_ro_accessors(qw( index ));
44 __PACKAGE__->mk_accessors(qw( sort_fields ));
46 # Constants to refer to the standard index names
47 Readonly our $BIBLIOS_INDEX => 'biblios';
48 Readonly our $AUTHORITIES_INDEX => 'authorities';
52 Koha::SearchEngine::Elasticsearch - Base module for things using elasticsearch
60 The name of the index to use, generally 'biblios' or 'authorities'.
70 my $self = $class->SUPER::new(@_);
71 # Check for a valid index
72 Koha::Exceptions::MissingParameter->throw('No index name provided') unless $self->index;
76 =head2 get_elasticsearch
78 my $elasticsearch_client = $self->get_elasticsearch();
80 Returns a C<Search::Elasticsearch> client. The client is cached on a C<Koha::SearchEngine::ElasticSearch>
81 instance level and will be reused if method is called multiple times.
85 sub get_elasticsearch {
87 unless (defined $self->{elasticsearch}) {
88 my $conf = $self->get_elasticsearch_params();
89 $self->{elasticsearch} = Search::Elasticsearch->new(
90 client => "5_0::Direct",
91 nodes => $conf->{nodes},
96 return $self->{elasticsearch};
99 =head2 get_elasticsearch_params
101 my $params = $self->get_elasticsearch_params();
103 This provides a hashref that contains the parameters for connecting to the
104 ElasicSearch servers, in the form:
107 'nodes' => ['127.0.0.1:9200', 'anotherserver:9200'],
108 'index_name' => 'koha_instance_index',
111 This is configured by the following in the C<config> block in koha-conf.xml:
114 <server>127.0.0.1:9200</server>
115 <server>anotherserver:9200</server>
116 <index_name>koha_instance</index_name>
121 sub get_elasticsearch_params {
124 # Copy the hash so that we're not modifying the original
125 my $conf = C4::Context->config('elasticsearch');
126 die "No 'elasticsearch' block is defined in koha-conf.xml.\n" if ( !$conf );
127 my $es = { %{ $conf } };
129 # Helpfully, the multiple server lines end up in an array for us anyway
130 # if there are multiple ones, but not if there's only one.
131 my $server = $es->{server};
132 delete $es->{server};
133 if ( ref($server) eq 'ARRAY' ) {
135 # store it called 'nodes' (which is used by newer Search::Elasticsearch)
136 $es->{nodes} = $server;
139 $es->{nodes} = [$server];
142 die "No elasticsearch servers were specified in koha-conf.xml.\n";
144 die "No elasticserver index_name was specified in koha-conf.xml.\n"
145 if ( !$es->{index_name} );
146 # Append the name of this particular index to our namespace
147 $es->{index_name} .= '_' . $self->index;
149 $es->{key_prefix} = 'es_';
153 =head2 get_elasticsearch_settings
155 my $settings = $self->get_elasticsearch_settings();
157 This provides the settings provided to Elasticsearch when an index is created.
158 These can do things like define tokenization methods.
160 A hashref containing the settings is returned.
164 sub get_elasticsearch_settings {
167 # Use state to speed up repeated calls
168 state $settings = undef;
169 if (!defined $settings) {
170 my $config_file = C4::Context->config('elasticsearch_index_config');
171 $config_file ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/index_config.yaml';
172 $settings = LoadFile( $config_file );
178 =head2 get_elasticsearch_mappings
180 my $mappings = $self->get_elasticsearch_mappings();
182 This provides the mappings that get passed to Elasticsearch when an index is
187 sub get_elasticsearch_mappings {
190 # Use state to speed up repeated calls
194 if (!defined $all_mappings{$self->index}) {
195 $sort_fields{$self->index} = {};
197 data => scalar _get_elasticsearch_mapping('general', '')
199 my $marcflavour = lc C4::Context->preference('marcflavour');
200 $self->_foreach_mapping(
202 my ( $name, $type, $facet, $suggestible, $sort, $marc_type ) = @_;
203 return if $marc_type ne $marcflavour;
204 # TODO if this gets any sort of complexity to it, it should
205 # be broken out into its own function.
207 # TODO be aware of date formats, but this requires pre-parsing
208 # as ES will simply reject anything with an invalid date.
209 my $es_type = 'text';
210 if ($type eq 'boolean') {
211 $es_type = 'boolean';
212 } elsif ($type eq 'number' || $type eq 'sum') {
213 $es_type = 'integer';
214 } elsif ($type eq 'isbn' || $type eq 'stdno') {
218 $mappings->{data}{properties}{$name} = _get_elasticsearch_mapping('search', $es_type);
221 $mappings->{data}{properties}{ $name . '__facet' } = _get_elasticsearch_mapping('facet', $es_type);
224 $mappings->{data}{properties}{ $name . '__suggestion' } = _get_elasticsearch_mapping('suggestible', $es_type);
226 # Sort is a bit special as it can be true, false, undef.
227 # We care about "true" or "undef",
228 # "undef" means to do the default thing, which is make it sortable.
229 if (!defined $sort || $sort) {
230 $mappings->{data}{properties}{ $name . '__sort' } = _get_elasticsearch_mapping('sort', $es_type);
231 $sort_fields{$self->index}{$name} = 1;
235 $all_mappings{$self->index} = $mappings;
237 $self->sort_fields(\%{$sort_fields{$self->index}});
239 return $all_mappings{$self->index};
242 =head2 _get_elasticsearch_mapping
244 Get the Elasticsearch mappings for the given purpose and data type.
246 $mapping = _get_elasticsearch_mapping('search', 'text');
250 sub _get_elasticsearch_mapping {
252 my ( $purpose, $type ) = @_;
254 # Use state to speed up repeated calls
255 state $settings = undef;
256 if (!defined $settings) {
257 my $config_file = C4::Context->config('elasticsearch_field_config');
258 $config_file ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/field_config.yaml';
259 $settings = LoadFile( $config_file );
262 if (!defined $settings->{$purpose}) {
263 die "Field purpose $purpose not defined in field config";
266 return $settings->{$purpose};
268 if (defined $settings->{$purpose}{$type}) {
269 return $settings->{$purpose}{$type};
271 if (defined $settings->{$purpose}{'default'}) {
272 return $settings->{$purpose}{'default'};
277 sub reset_elasticsearch_mappings {
278 my ( $reset_fields ) = @_;
279 my $mappings_yaml = C4::Context->config('elasticsearch_index_mappings');
280 $mappings_yaml ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/mappings.yaml';
281 my $indexes = LoadFile( $mappings_yaml );
283 while ( my ( $index_name, $fields ) = each %$indexes ) {
284 while ( my ( $field_name, $data ) = each %$fields ) {
285 my $field_type = $data->{type};
286 my $field_label = $data->{label};
287 my $mappings = $data->{mappings};
288 my $search_field = Koha::SearchFields->find_or_create({ name => $field_name, label => $field_label, type => $field_type }, { key => 'name' });
289 for my $mapping ( @$mappings ) {
290 my $marc_field = Koha::SearchMarcMaps->find_or_create({ index_name => $index_name, marc_type => $mapping->{marc_type}, marc_field => $mapping->{marc_field} });
291 $search_field->add_to_search_marc_maps($marc_field, { facet => $mapping->{facet} || 0, suggestible => $mapping->{suggestible} || 0, sort => $mapping->{sort} } );
297 # This overrides the accessor provided by Class::Accessor so that if
298 # sort_fields isn't set, then it'll generate it.
302 $self->_sort_fields_accessor(@_);
305 my $val = $self->_sort_fields_accessor();
308 # This will populate the accessor as a side effect
309 $self->get_elasticsearch_mappings();
310 return $self->_sort_fields_accessor();
313 =head2 _process_mappings($mappings, $data, $record_document, $altscript)
315 $self->_process_mappings($mappings, $marc_field_data, $record_document, 0)
317 Process all C<$mappings> targets operating on a specific MARC field C<$data>.
318 Since we group all mappings by MARC field targets C<$mappings> will contain
319 all targets for C<$data> and thus we need to fetch the MARC field only once.
320 C<$mappings> will be applied to C<$record_document> and new field values added.
321 The method has no return value.
327 Arrayref of mappings containing arrayrefs in the format
328 [C<$target>, C<$options>] where C<$target> is the name of the target field and
329 C<$options> is a hashref containing processing directives for this particular
334 The source data from a MARC record field.
336 =item C<$record_document>
338 Hashref representing the Elasticsearch document on which mappings should be
343 A boolean value indicating whether an alternate script presentation is being
350 sub _process_mappings {
351 my ($_self, $mappings, $data, $record_document, $altscript) = @_;
352 foreach my $mapping (@{$mappings}) {
353 my ($target, $options) = @{$mapping};
355 # Don't process sort fields for alternate scripts
356 my $sort = $target =~ /__sort$/;
357 if ($sort && $altscript) {
361 # Copy (scalar) data since can have multiple targets
362 # with differing options for (possibly) mutating data
363 # so need a different copy for each
365 $record_document->{$target} //= [];
366 if (defined $options->{substr}) {
367 my ($start, $length) = @{$options->{substr}};
368 $_data = length($data) > $start ? substr $data, $start, $length : '';
370 if (defined $options->{value_callbacks}) {
371 $_data = reduce { $b->($a) } ($_data, @{$options->{value_callbacks}});
373 if (defined $options->{property}) {
375 $options->{property} => $_data
378 push @{$record_document->{$target}}, $_data;
382 =head2 marc_records_to_documents($marc_records)
384 my @record_documents = $self->marc_records_to_documents($marc_records);
386 Using mappings stored in database convert C<$marc_records> to Elasticsearch documents.
388 Returns array of hash references, representing Elasticsearch documents,
389 acceptable as body payload in C<Search::Elasticsearch> requests.
393 =item C<$marc_documents>
395 Reference to array of C<MARC::Record> objects to be converted to Elasticsearch documents.
401 sub marc_records_to_documents {
402 my ($self, $records) = @_;
403 my $rules = $self->_get_marc_mapping_rules();
404 my $control_fields_rules = $rules->{control_fields};
405 my $data_fields_rules = $rules->{data_fields};
406 my $marcflavour = lc C4::Context->preference('marcflavour');
408 my @record_documents;
410 foreach my $record (@{$records}) {
411 my $record_document = {};
412 my $mappings = $rules->{leader};
414 $self->_process_mappings($mappings, $record->leader(), $record_document, 0);
416 foreach my $field ($record->fields()) {
417 if ($field->is_control_field()) {
418 my $mappings = $control_fields_rules->{$field->tag()};
420 $self->_process_mappings($mappings, $field->data(), $record_document, 0);
424 my $tag = $field->tag();
425 # Handle alternate scripts in MARC 21
427 if ($marcflavour eq 'marc21' && $tag eq '880') {
428 my $sub6 = $field->subfield('6');
429 if ($sub6 =~ /^(...)-\d+/) {
435 my $data_field_rules = $data_fields_rules->{$tag};
437 if ($data_field_rules) {
438 my $subfields_mappings = $data_field_rules->{subfields};
439 my $wildcard_mappings = $subfields_mappings->{'*'};
440 foreach my $subfield ($field->subfields()) {
441 my ($code, $data) = @{$subfield};
442 my $mappings = $subfields_mappings->{$code} // [];
443 if ($wildcard_mappings) {
444 $mappings = [@{$mappings}, @{$wildcard_mappings}];
447 $self->_process_mappings($mappings, $data, $record_document, $altscript);
451 my $subfields_join_mappings = $data_field_rules->{subfields_join};
452 if ($subfields_join_mappings) {
453 foreach my $subfields_group (keys %{$subfields_join_mappings}) {
454 # Map each subfield to values, remove empty values, join with space
459 map { join(' ', $field->subfield($_)) } split(//, $subfields_group)
463 $self->_process_mappings($subfields_join_mappings->{$subfields_group}, $data, $record_document, $altscript);
470 foreach my $field (keys %{$rules->{defaults}}) {
471 unless (defined $record_document->{$field}) {
472 $record_document->{$field} = $rules->{defaults}->{$field};
475 foreach my $field (@{$rules->{sum}}) {
476 if (defined $record_document->{$field}) {
477 # TODO: validate numeric? filter?
478 # TODO: Or should only accept fields without nested values?
479 # TODO: Quick and dirty, improve if needed
480 $record_document->{$field} = sum0(grep { !ref($_) && m/\d+(\.\d+)?/} @{$record_document->{$field}});
483 # Index all applicable ISBN forms (ISBN-10 and ISBN-13 with and without dashes)
484 foreach my $field (@{$rules->{isbn}}) {
485 if (defined $record_document->{$field}) {
487 foreach my $input_isbn (@{$record_document->{$field}}) {
488 my $isbn = Business::ISBN->new($input_isbn);
489 if (defined $isbn && $isbn->is_valid) {
490 my $isbn13 = $isbn->as_isbn13->as_string;
491 push @isbns, $isbn13;
493 push @isbns, $isbn13;
495 my $isbn10 = $isbn->as_isbn10;
497 $isbn10 = $isbn10->as_string;
498 push @isbns, $isbn10;
500 push @isbns, $isbn10;
503 push @isbns, $input_isbn;
506 $record_document->{$field} = \@isbns;
510 # Remove duplicate values and collapse sort fields
511 foreach my $field (keys %{$record_document}) {
512 if (ref($record_document->{$field}) eq 'ARRAY') {
513 @{$record_document->{$field}} = do {
515 grep { !$seen{ref($_) eq 'HASH' && defined $_->{input} ? $_->{input} : $_}++ } @{$record_document->{$field}};
517 if ($field =~ /__sort$/) {
518 # Make sure to keep the sort field length sensible. 255 was chosen as a nice round value.
519 $record_document->{$field} = [substr(join(' ', @{$record_document->{$field}}), 0, 255)];
524 # TODO: Perhaps should check if $records_document non empty, but really should never be the case
525 $record->encoding('UTF-8');
528 # Temporarily intercept all warn signals (MARC::Record carps when record length > 99999)
529 local $SIG{__WARN__} = sub {
530 push @warnings, $_[0];
532 $record_document->{'marc_data'} = encode_base64(encode('UTF-8', $record->as_usmarc()));
535 # Suppress warnings if record length exceeded
536 unless (substr($record->leader(), 0, 5) eq '99999') {
537 foreach my $warning (@warnings) {
541 $record_document->{'marc_data'} = $record->as_xml_record($marcflavour);
542 $record_document->{'marc_format'} = 'MARCXML';
545 $record_document->{'marc_format'} = 'base64ISO2709';
547 my $id = $record->subfield('999', 'c');
548 push @record_documents, [$id, $record_document];
550 return \@record_documents;
553 =head2 _field_mappings($facet, $suggestible, $sort, $target_name, $target_type, $range)
555 my @mappings = _field_mappings($facet, $suggestible, $sort, $target_name, $target_type, $range)
557 Get mappings, an internal data structure later used by
558 L<_process_mappings($mappings, $data, $record_document, $altscript)> to process MARC target
559 data for a MARC mapping.
561 The returned C<$mappings> is not to to be confused with mappings provided by
562 C<_foreach_mapping>, rather this sub accepts properties from a mapping as
563 provided by C<_foreach_mapping> and expands it to this internal data structure.
564 In the caller context (C<_get_marc_mapping_rules>) the returned C<@mappings>
565 is then applied to each MARC target (leader, control field data, subfield or
566 joined subfields) and integrated into the mapping rules data structure used in
567 C<marc_records_to_documents> to transform MARC records into Elasticsearch
574 Boolean indicating whether to create a facet field for this mapping.
576 =item C<$suggestible>
578 Boolean indicating whether to create a suggestion field for this mapping.
582 Boolean indicating whether to create a sort field for this mapping.
584 =item C<$target_name>
586 Elasticsearch document target field name.
588 =item C<$target_type>
590 Elasticsearch document target field type.
594 An optional range as a string in the format "<START>-<END>" or "<START>",
595 where "<START>" and "<END>" are integers specifying a range that will be used
596 for extracting a substring from MARC data as Elasticsearch field target value.
598 The first character position is "1", and the range is inclusive,
599 so "1-3" means the first three characters of MARC data.
601 If only "<START>" is provided only one character at position "<START>" will
608 sub _field_mappings {
609 my ($_self, $facet, $suggestible, $sort, $target_name, $target_type, $range) = @_;
610 my %mapping_defaults = ();
613 my $substr_args = undef;
615 # TODO: use value_callback instead?
616 my ($start, $end) = map(int, split /-/, $range, 2);
617 $substr_args = [$start];
618 push @{$substr_args}, (defined $end ? $end - $start + 1 : 1);
620 my $default_options = {};
622 $default_options->{substr} = $substr_args;
625 # TODO: Should probably have per type value callback/hook
626 # but hard code for now
627 if ($target_type eq 'boolean') {
628 $default_options->{value_callbacks} //= [];
629 push @{$default_options->{value_callbacks}}, sub {
631 # Trim whitespace at both ends
632 $value =~ s/^\s+|\s+$//g;
633 return $value ? 'true' : 'false';
637 my $mapping = [$target_name, $default_options];
638 push @mappings, $mapping;
641 push @suffixes, 'facet' if $facet;
642 push @suffixes, 'suggestion' if $suggestible;
643 push @suffixes, 'sort' if !defined $sort || $sort;
645 foreach my $suffix (@suffixes) {
646 my $mapping = ["${target_name}__$suffix"];
647 # TODO: Hack, fix later in less hideous manner
648 if ($suffix eq 'suggestion') {
649 push @{$mapping}, {%{$default_options}, property => 'input'};
652 push @{$mapping}, $default_options;
654 push @mappings, $mapping;
659 =head2 _get_marc_mapping_rules
661 my $mapping_rules = $self->_get_marc_mapping_rules()
663 Generates rules from mappings stored in database for MARC records to Elasticsearch JSON document conversion.
665 Since field retrieval is slow in C<MARC::Records> (all fields are itereted through for
666 each call to C<MARC::Record>->field) we create an optimized structure of mapping
667 rules keyed by MARC field tags holding all the mapping rules for that particular tag.
669 We can then iterate through all MARC fields for each record and apply all relevant
670 rules once per fields instead of retreiving fields multiple times for each mapping rule
671 which is terribly slow.
675 # TODO: This structure can be used for processing multiple MARC::Records so is currently
676 # rebuilt for each batch. Since it is cacheable it could also be stored in an in
677 # memory cache which it is currently not. The performance gain of caching
678 # would probably be marginal, but to do this could be a further improvement.
680 sub _get_marc_mapping_rules {
682 my $marcflavour = lc C4::Context->preference('marcflavour');
683 my $field_spec_regexp = qr/^([0-9]{3})([()0-9a-z]+)?(?:_\/(\d+(?:-\d+)?))?$/;
684 my $leader_regexp = qr/^leader(?:_\/(\d+(?:-\d+)?))?$/;
687 'control_fields' => {},
694 $self->_foreach_mapping(sub {
695 my ($name, $type, $facet, $suggestible, $sort, $marc_type, $marc_field) = @_;
696 return if $marc_type ne $marcflavour;
698 if ($type eq 'sum') {
699 push @{$rules->{sum}}, $name;
701 elsif ($type eq 'isbn') {
702 push @{$rules->{isbn}}, $name;
704 elsif ($type eq 'boolean') {
705 # boolean gets special handling, if value doesn't exist for a field,
707 $rules->{defaults}->{$name} = 'false';
710 if ($marc_field =~ $field_spec_regexp) {
715 # Parse and separate subfields form subfield groups
717 my $subfield_group = '';
720 foreach my $token (split //, $2) {
723 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
724 "Unmatched opening parenthesis for $marc_field"
731 elsif ($token eq ")") {
733 if ($subfield_group) {
734 push @subfield_groups, $subfield_group;
735 $subfield_group = '';
740 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
741 "Unmatched closing parenthesis for $marc_field"
745 elsif ($open_group) {
746 $subfield_group .= $token;
749 push @subfields, $token;
754 push @subfields, '*';
757 my $range = defined $3 ? $3 : undef;
758 my @mappings = $self->_field_mappings($facet, $suggestible, $sort, $name, $type, $range);
760 if ($field_tag < 10) {
761 $rules->{control_fields}->{$field_tag} //= [];
762 push @{$rules->{control_fields}->{$field_tag}}, @mappings;
765 $rules->{data_fields}->{$field_tag} //= {};
766 foreach my $subfield (@subfields) {
767 $rules->{data_fields}->{$field_tag}->{subfields}->{$subfield} //= [];
768 push @{$rules->{data_fields}->{$field_tag}->{subfields}->{$subfield}}, @mappings;
770 foreach my $subfield_group (@subfield_groups) {
771 $rules->{data_fields}->{$field_tag}->{subfields_join}->{$subfield_group} //= [];
772 push @{$rules->{data_fields}->{$field_tag}->{subfields_join}->{$subfield_group}}, @mappings;
776 elsif ($marc_field =~ $leader_regexp) {
777 my $range = defined $1 ? $1 : undef;
778 my @mappings = $self->_field_mappings($facet, $suggestible, $sort, $name, $type, $range);
779 push @{$rules->{leader}}, @mappings;
782 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
783 "Invalid MARC field expression: $marc_field"
790 =head2 _foreach_mapping
792 $self->_foreach_mapping(
794 my ( $name, $type, $facet, $suggestible, $sort, $marc_type,
797 return unless $marc_type eq 'marc21';
798 print "Data comes from: " . $marc_field . "\n";
802 This allows you to apply a function to each entry in the elasticsearch mappings
803 table, in order to build the mappings for whatever is needed.
805 In the provided function, the files are:
811 The field name for elasticsearch (corresponds to the 'mapping' column in the
816 The type for this value, e.g. 'string'.
820 True if this value should be facetised. This only really makes sense if the
821 field is understood by the facet processing code anyway.
825 True if this is a field that a) needs special sort handling, and b) if it
826 should be sorted on. False if a) but not b). Undef if not a). This allows,
827 for example, author to be sorted on but not everything marked with "author"
828 to be included in that sort.
832 A string that indicates the MARC type that this mapping is for, e.g. 'marc21',
833 'unimarc', 'normarc'.
837 A string that describes the MARC field that contains the data to extract.
838 These are of a form suited to Catmandu's MARC fixers.
844 sub _foreach_mapping {
845 my ( $self, $sub ) = @_;
847 # TODO use a caching framework here
848 my $search_fields = Koha::Database->schema->resultset('SearchField')->search(
850 'search_marc_map.index_name' => $self->index,
852 { join => { search_marc_to_fields => 'search_marc_map' },
854 'search_marc_to_fields.facet',
855 'search_marc_to_fields.suggestible',
856 'search_marc_to_fields.sort',
857 'search_marc_map.marc_type',
858 'search_marc_map.marc_field',
870 while ( my $search_field = $search_fields->next ) {
872 # Force lower case on indexed field names for case insensitive
873 # field name searches
874 lc($search_field->name),
876 $search_field->get_column('facet'),
877 $search_field->get_column('suggestible'),
878 $search_field->get_column('sort'),
879 $search_field->get_column('marc_type'),
880 $search_field->get_column('marc_field'),
887 die process_error($@);
889 This parses an Elasticsearch error message and produces a human-readable
890 result from it. This result is probably missing all the useful information
891 that you might want in diagnosing an issue, so the warning is also logged.
893 Note that currently the resulting message is not internationalised. This
894 will happen eventually by some method or other.
899 my ($self, $msg) = @_;
901 warn $msg; # simple logging
903 # This is super-primitive
904 return "Unable to understand your search query, please rephrase and try again.\n" if $msg =~ /ParseException/;
906 return "Unable to perform your search. Please try again.\n";
909 =head2 _read_configuration
911 my $conf = _read_configuration();
913 Reads the I<configuration file> and returns a hash structure with the
914 configuration information. It raises an exception if mandatory entries
917 The hashref structure has the following form:
920 'nodes' => ['127.0.0.1:9200', 'anotherserver:9200'],
921 'index_name' => 'koha_instance',
924 This is configured by the following in the C<config> block in koha-conf.xml:
927 <server>127.0.0.1:9200</server>
928 <server>anotherserver:9200</server>
929 <index_name>koha_instance</index_name>
934 sub _read_configuration {
938 my $conf = C4::Context->config('elasticsearch');
939 Koha::Exceptions::Config::MissingEntry->throw(
940 "Missing 'elasticsearch' block in config file")
941 unless defined $conf;
943 if ( $conf && $conf->{server} ) {
944 my $nodes = $conf->{server};
945 if ( ref($nodes) eq 'ARRAY' ) {
946 $configuration->{nodes} = $nodes;
949 $configuration->{nodes} = [$nodes];
953 Koha::Exceptions::Config::MissingEntry->throw(
954 "Missing 'server' entry in config file for elasticsearch");
957 if ( defined $conf->{index_name} ) {
958 $configuration->{index_name} = $conf->{index_name};
961 Koha::Exceptions::Config::MissingEntry->throw(
962 "Missing 'index_name' entry in config file for elasticsearch");
965 return $configuration;
976 =item Chris Cormack C<< <chrisc@catalyst.net.nz> >>
978 =item Robin Sheat C<< <robin@catalyst.net.nz> >>
980 =item Jonathan Druart C<< <jonathan.druart@bugs.koha-community.org> >>