get -Dtests.verbose passing through Maven
add versioning test
Core: switch to the new ConcurrentHashMap implementation coming in Java 8

The new implementation has lower RAM overhead and better concurrency
in some cases.

Closes #6400
Scripts: exposed _uid, _id and _type fields as stored fields (_fields notation)

The _uid field wasn't available in a script despite it's always stored. Made it available and made available also _id and _type fields that are deducted from it.

Closes #6406
revert CHMV8 for now (it doesn't compile under Java8)
[DOCS] Added Javadocs to ESLogger and ESLoggerFactory
[DOCS] Replace facets example with aggregations in warmers docs
[DOCS] Clean up Java-API docs

Fixed some wording and subject/verb agreement while reading through the Java API documentation.
[DOCS] Fixed typo in object-type.asciidoc
Core: switch to the new ConcurrentHashMap implementation coming in Java 8

The new implementation has lower RAM overhead and better concurrency
in some cases.

Closes #6400