Bug 17255 - Upgrade Elastic Search code to work with version 2.4+ - rebased wip

Bug 17255 - Upgrade Elastic Search code to work with version 2.4+ - rebased wip

-Changed deprecated facets to aggregations
-Fixed boolean datatypes not allowing analyzers to be specified
-Fixed deprecated '_id' to 'es_id'. Now the ES-index has the correct id==biblionumber

ZE TEST PLAN

1. Reset Zebra index since facets are hard coded to dynamic search_marc_mappings.
2. perl misc/search_tools/rebuild_elastic_search.pl
3. Fetch all indexed records and the facet for subject__facet

curl -XGET localhost:9200/koha_biblios/data/_search?pretty -d '{
  "aggregations": {
    "my_agg": {
      "terms": {
        "field": "subject__facet"
      }
    }
  }
}'

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>