Release Notes:
Upgrade Notes:
Upgrading from 0.19 requires a full cluster restart.
Breaking changes:
Introduce Text abstraction, allowing for improved representation of strings, apply to HighlightedField (breaks backward for Java API from String to Text) (#2093)
Stored binary fields to change internal representation (break Java API if used) (#2092)
Transport: Add header token allowing to more easily identify when illegal content is being sent (#2280)
New features:
Add types exists api (#2273)
Add has_parent query (#2254)
Add has_parent filter (#2243)
Add ignore_indices option (#2209)
Bulk UDP (#2201)
Explain API (#2184)
Support GeoShape searching and indexing (#2169)
Multi match query (#2153)
Cluster Nodes hot_threads API (#2134)
Support wildcard and +/- notation for multi index APIs (#2074)
Auto import dangling indices (#2067)
Store Throttling (node level and/or index level) with options on merge or all (#2041)
Stored Fields Compression (#2037)
Allow to customize quote analyzer to be used when quoting text in a query_string (#1931)
Index Warmup API (#1913)
Upgrade to Lucene 3.6 (#1862)
Cluster Reroute API: Allow to specify allocation commands (#2256)
Compression: Support snappy as a compression option (#2081)
Create Index: Allow to provide index warmers when creating an index (#1917)
Index Blocks: Add index.blocks.write, index.blocks.read, and index.blocks.metadata settings (#1771)
Index Template: Allow to register index warmers in an index template (#1916)
Mapping: Add index_options (deprecating omit_term_freq_and_positions) (#2346)
Query DSL: query_string syntax to support wildcard fieldnames in the query text (#1936)
Store Compression: Term Vector Vector (#2049)
Update API: Allow to upsert, provide a doc and index it if the doc does not exists (#2008)
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