Update databases/elasticsearch to 1.6.0

elasticsearch 1.6.0

Breaking changes
- Benchmark api: removed leftovers
- Wildcard field names in highlighting should only return fields that
  can be highlighted
- Remove unsafe options
- Fix FSRepository location configuration

Deprecations
- Deprecate async replication
- Query DSL: deprecate BytesFilterBuilder in favour of WrapperFilterBuilder
- Deprecate async replication
- Deprecate the More-Like-This API in favour of the MLT query
- Deprecate rivers
- Warning in documentation for deprecation of rivers
- Deprecated the thrift and memcached transports
- Deprecate the top_children query
- Plugins: deprecate addQuery methods that are going to be removed in 2.0
- Deprecate Groovy sandbox and related settings
- Deprecate delete-by-query in client/transport/action APIs too
- Deprecate filter option in PhraseSuggester collate

New features
- Add ability to specify a SizeBasedTriggeringPolicy for log configuration
- Bring back numeric_resolution
- API: Add response filtering with filter_path parameter
- Synced flush backport
- Move index sealing terminology to synced flush
- Seal indices for faster recovery
- Add support for fine-grained settings
- Validate API: provide more verbose explanation
- Add ability to prompt for selected settings on startup
- bootstrap.mlockall for Windows (VirtualLock)
- Allow shards on shared filesystems to be recovered on any node
- Add field stats api

For a full changelog see here:

  https://www.elastic.co/downloads/past-releases/elasticsearch-1-6-0

elasticsearch 1.5.2

Security
- Ensure URL expansion only works within the plugins directory

Enhancements
- Only flush for checkindex if we have uncommitted changes
- Update tree_level and precision parameter priorities
- Add merge conflicts to GeoShapeFieldMapper
- pom.xml updates to allow m2e integration to work correctly
- Fix to pom.xml to allow eclipse maven integration using m2e
- Eclipse fixes
- Implement retries for ShadowEngine creation
- Allow rebalancing primary shards on shared filesystems
- Update forbiddenapis to version 1.8

Bug fixes
- Fix _as_string output to only show when format specified
- _default_ mapping should be picked up from index template during
  auto create index
- Correct ShapeBuilder coordinate parser to ignore values in 3rd+ dimension
- Fix hole intersection at tangential coordinate
- Search: FielddataTermsFilter equality is based on hash codes
- Fix possible NPE in InternalClusterService$NotifyTimeout, the future
  field is set from a different thread
- Add missing hashCode method to RecoveryState#File
- Make GeoContext mapping idempotent
- Fixed an equality check in StringFieldMapper.
- Score value is 0 in _explanation with random_score query
- Fix updating templates.
- Analysis: fix ignoring tokenizer settings in SynonymTokenFilterFactory
- ShardTermVectorsService calls docFreq() on unpositioned TermsEnum
- FSTranslog#snapshot() can enter infinite loop

elasticsearch 1.5.1

Deprecations
- Warning in documentation for deprecation of rivers

Enhancements
- Core: also refresh if many deletes in a row use up too much
  version map RAM
- Use static logger name in Engine.java
- service.bat file should explicitly use the Windows find command.
- AbstractBlobContainer.deleteByPrefix() should not list all blobs

Bug fixes
- Core: Lucene merges should run on the target shard during recovery
- Sync translog before closing engine
- Fix validate_* merge policy for GeoPointFieldMapper
- Make sure size=0 works on the inner_hits level.
- Make sure inner hits also work for nested fields defined in object field
- Fix bug where parse error is thrown if a inner filter is used in
  a nested filter/query.
- Fix nested stored field support.
- Bugfix+unittest for unneccesary mapping refreshes caused by unordered
  fielddata settings
- Don't try to send a mapping refresh if there is no master
- Fix _field_names to be disabled on pre 1.3.0 indexes
- Transport: fix racing condition in timeout handling
- Children aggregation: Fix 2 bugs in children agg
- Fix wrong use of currentFieldName outside of a parsing loop
- Avoid NPE during query parsing
- Function score: apply min_score to sub query score if
  no function provided
- Function_score: undo "Remove explanation of query score from functions"
- State: Refactor state format to use incremental state IDs
- Recovery: RecoveryState.File.toXContent reports file length
  as recovered bytes
- Fail shard when index service/mappings fails to instantiate
- Don't reuse source index UUID on restore
- Snapshot/Restore: separate repository registration
- Automatically add "index." prefix to the settings are changed
  on restore...

elasticsearch 1.5.0

Breaking changes
- Aliases: Throw exception if index is null or missing when creating
  an alias
- Benchmark api: removed leftovers
- Resiliency: Throw exception if the JVM will corrupt data
- [ENGINE] Remove full flush / FlushType.NEW_WRITER
- Change behaviour of indices segments api to allow no indices
- Plugins: Don't overwrite plugin configuration when removing/upgrading
  plugins
- [QUERY] Remove lowercase_expanded_terms and locale options
- Recovery: RecoveryState clean up
- Scripting: cleanup ScriptService & friends
- Disable dynamic Groovy scripting by marking Groovy as not sandboxed
- Scripting: Script with _score: remove dependency of DocLookup and scorer

Deprecations
- Deprecate async replication
- Core: deprecate index.fail_on_merge_failure
- Mappings: Deprecate _analyzer and per query analyzers
- Deprecation: MLT Field Query
- Deprecated the thrift and memcached transports
- Core: add deprecation messages for delete-by-query

New features
- New aggregations feature - "PercentageScore" heuristic
  for significant_terms
- significant terms: add scriptable significance heuristic
- Cat API: show open and closed indices in _cat/indices
- Circuit Breakers: Add NoopCircuitBreaker used in NoneCircuitBreakerService
- Shadow replicas on shared filesystems
- MLT Query: Support for artificial documents
- Add time_zone setting for query_string
- Search: add format support for date range filter and queries
- Add min_score parameter to function score query to only match docs
  above this threshold
- Add inner hits to nested and parent/child queries
- Add index.data_path setting
- Term Vectors/MLT Query: support for different analyzers than default
  at the field

For a full changelog see here:

  https://www.elastic.co/downloads/past-releases/elasticsearch-1-5-0


(fhajny)