Remove search operation threading option
Search operation threading is an option that is not really used, and current non default implementations are flawed. Handling it also creates quite the complexity in the search handling codebase...
This is a breaking change, but one that is actually a good one, since I haven't seen/heard anybody use it, and if its used, its problematic...
closes #6042
remove jdk6 from travis options for our java 7 supported branches
only test on openjdk 7 on travis, no need to tax it
Cluster State API: Remove index template filtering

The possibility of filtering for index templates in the cluster state API
had been introduced before there was a dedicated index templates API. This
commit removes this support from the cluster state API, as it was not really
clean, requiring you to specify the metadata and the index templates.

Closes #4954
Analyze API: Default analyzer accidentally removed stopwords

The analyze API used the standard analyzer from lucene and therefore removed
stopwords instead of using the elasticsearch default analyzer.

Closes #5974
Remove operation threading from broadcast actions
Similar to search removal, the operation threading options are not really ued, and the default should always be used. This also considerably simplifies the code.
A side affect is that we can now remove the ShardIterator#firstOrNull method, which can cause for sneaky bugs to occur.
closes #6044
[REST] Missing scroll id now returns 404

A bad/non-existing scroll ID used to return a 200, however a 404 might be more useful.
Also, this PR returns the right Exception (SearchContextMissingException) in the Java API.

Additionally: Added StatusToXContent interface and RestStatusToXContentListener listener, so
the appropriate RestStatus can be returned

Closes #5729
Added char_filters param to indices.analyze spec
[DOCS] Changed score_type to score_mode for has_child/parent queries
fix docs for merging and throttling
[DOC] Fix default values for filter cache size and field data circuit breaker.

Relates to #5990
[DOCS] Update phrase-suggest.asciidoc

Grammatical error

Close #5993
[DOCS] Update client.asciidoc

Should be classpath rather than classloader.

Close #5965
[DOCS] Fixed a typo

Close #5963
[DOCS] Update service.bat

corrected typo, Exiting instead of Existing

Close #5885
[TEST] Random dynamic templates.

This change randomly indexes the _id field and randomizes field data formats
and loading.

Close #5834
[TESTS] Don't randomize mappings in SimpleValidateQueryTests.

This test relies on the fact that the _id field is not indexed.
Remove RootMapper.validate and validate the routing key up-front.

RootMapper.validate was only used by the routing field mapper, which makes
buggy assumptions about how fields are indexed. For example, it assumes that
the index representation of a field is the same as its external representation.

Close #5844
Made it mandatory to specify IndicesOptions when calling MetaData#concreteIndices

Removed MetaData#concreteIndices variations that didn't require an IndicesOptions argument. Every caller should specify how indices should be resolved to concrete indices based on the indices options argument.

Closes #6059
Remove unused dump infra
Way back when, when ES started, there was an idea for a dump infrastructure, but it ended up supporting its serviceability aspects through APIs, remove the unused code