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