Bug 20244: Improve Elasticsearch ISBN indexing

https://bugs.koha-community.org/show_bug.cgi?id=20244

Test plan:

1. Add a record with an ISBN-10 or ISBN-13 that can be converted to ISBN-10 (e.g. 1-56619-909-3).
2. Verify that the record can be found by searching for "1-56619-909-3", "1566199093", "978-1-56619-909-4" and "9781566199094".

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>

Koha/SearchEngine/Elasticsearch.pm

@@ -38,6 +38,7 @@ use List::Util qw( sum0 reduce );
 use MARC::File::XML;
 use MIME::Base64;
 use Encode qw(encode);
+use Business::ISBN;
 
 __PACKAGE__->mk_ro_accessors(qw( index ));
 __PACKAGE__->mk_accessors(qw( sort_fields ));
@@ -456,6 +457,33 @@ sub marc_records_to_documents {
                 $record_document->{$field} = sum0(grep { !ref($_) && m/\d+(\.\d+)?/} @{$record_document->{$field}});
             }
         }
+        # Index all applicable ISBN forms (ISBN-10 and ISBN-13 with and without dashes)
+        foreach my $field (@{$rules->{isbn}}) {
+            if (defined $record_document->{$field}) {
+                my @isbns = ();
+                foreach my $input_isbn (@{$record_document->{$field}}) {
+                    my $isbn = Business::ISBN->new($input_isbn);
+                    if (defined $isbn && $isbn->is_valid) {
+                        my $isbn13 = $isbn->as_isbn13->as_string;
+                        push @isbns, $isbn13;
+                        $isbn13 =~ s/\-//g;
+                        push @isbns, $isbn13;
+
+                        my $isbn10 = $isbn->as_isbn10;
+                        if ($isbn10) {
+                            $isbn10 = $isbn10->as_string;
+                            push @isbns, $isbn10;
+                            $isbn10 =~ s/\-//g;
+                            push @isbns, $isbn10;
+                        }
+                    } else {
+                        push @isbns, $input_isbn;
+                    }
+                }
+                $record_document->{$field} = \@isbns;
+            }
+        }
+
         # TODO: Perhaps should check if $records_document non empty, but really should never be the case
         $record->encoding('UTF-8');
         my @warnings;
@@ -622,6 +650,7 @@ sub _get_marc_mapping_rules {
         'control_fields' => {},
         'data_fields' => {},
         'sum' => [],
+        'isbn' => [],
         'defaults' => {}
     };
 
@@ -632,6 +661,9 @@ sub _get_marc_mapping_rules {
         if ($type eq 'sum') {
             push @{$rules->{sum}}, $name;
         }
+        elsif ($type eq 'isbn') {
+            push @{$rules->{isbn}}, $name;
+        }
         elsif ($type eq 'boolean') {
             # boolean gets special handling, if value doesn't exist for a field,
             # it is set to false

t/Koha/SearchEngine/Elasticsearch.t

@@ -117,7 +117,7 @@ subtest 'get_elasticsearch_mappings() tests' => sub {
 
 subtest 'Koha::SearchEngine::Elasticsearch::marc_records_to_documents () tests' => sub {
 
-    plan tests => 45;
+    plan tests => 32;
 
     t::lib::Mocks::mock_preference('marcflavour', 'MARC21');
 
@@ -131,6 +131,15 @@ subtest 'Koha::SearchEngine::Elasticsearch::marc_records_to_documents () tests'
             marc_type => 'marc21',
             marc_field => '001',
         },
+        {
+            name => 'isbn',
+            type => 'isbn',
+            facet => 0,
+            suggestible => 0,
+            sort => 0,
+            marc_type => 'marc21',
+            marc_field => '020a',
+        },
         {
             name => 'author',
             type => 'string',
@@ -246,6 +255,7 @@ subtest 'Koha::SearchEngine::Elasticsearch::marc_records_to_documents () tests'
     $marc_record_1->leader('     cam  22      a 4500');
     $marc_record_1->append_fields(
         MARC::Field->new('001', '123'),
+        MARC::Field->new('020', '', '', a => '1-56619-909-3'),
         MARC::Field->new('100', '', '', a => 'Author 1'),
         MARC::Field->new('110', '', '', a => 'Corp Author'),
         MARC::Field->new('210', '', '', a => 'Title 1'),
@@ -271,7 +281,6 @@ subtest 'Koha::SearchEngine::Elasticsearch::marc_records_to_documents () tests'
     my $docs = $see->marc_records_to_documents($records);
 
     # First record:
-
     is(scalar @{$docs}, 2, 'Two records converted to documents');
 
     is($docs->[0][0], '1234567', 'First document biblionumber should be set as first element in document touple');
@@ -360,6 +369,9 @@ subtest 'Koha::SearchEngine::Elasticsearch::marc_records_to_documents () tests'
         'First document type_of_record_and_bib_level field should be set correctly'
     );
 
+    is(scalar @{$docs->[0][1]->{isbn}}, 4, 'First document isbn field should contain four values');
+    is_deeply($docs->[0][1]->{isbn}, ['978-1-56619-909-4', '9781566199094', '1-56619-909-3', '1566199093'], 'First document isbn field should be set correctly');
+
     # Second record:
 
     is(scalar @{$docs->[1][1]->{author}}, 1, 'Second document author field should contain one value');