5.0.0-alpha3 Feature parity

[russcam]

See https://www.elastic.co/guide/en/elasticsearch/reference/master/release-notes-5.0.0-alpha3.html

Breaking changes

CAT API

• Row-centric output for _cat/fielddata #18068 (issue: #10249)

Inner Hits

• Drop top level inner hits in favour of inner hits defined in the query dsl #17816 (issue: #11118). demonstrate with example of descending has_child queries with inner_hits

Plugin Delete By Query

• Remove Delete-By-Query plugin #18516 (issue: #18469). Update Delete By Query to use API instead of plugin

Search

• Refactor of query profile classes to make way for other profile implementations #18370 (issue: #10538). Renaming of properties on Profile

Features

Ingest

• Add a Sort ingest processor #17999
• Add date_index_name processor #17973 (issue: #17814)

Reindex API

Port Delete By Query to Reindex infrastructure #18329 (issue: #16883)

Stats

• Extend field stats to report searchable/aggregatable fields #17980 (issue: #17750)

Enhancements

Allocation

• Add the shard’s store status to the explain API #17689 (issue: #17372)

CAT API

• Add node name to Cat Recovery #18187 (issue: Uneven distribution of docs across shards, even with auto-generated ids #8041)
• Add support for documented byte/size units and for micros as a time unit in _cat API #17779

Query DSL

• Don’t allow fuzziness for multi_match types cross_fields, phrase and phrase_prefix #18322 (issues: Add field_multi_value_leniency to SQL APIs #6866, [DOCS] Adds getting started content based on the template #7764)

Search

• Introduces GeoValidationMethod to GeoDistanceSortBuilder #18036 - Deprecate coerce and ignore_malformed on GeoPolygonQuery, GeoDistanceRangeQuery, GeoDistanceQuery and GeoBoundingBoxQuery in favour of validation method