Update forbidden-apis to 1.6

Closes #7158
Add more logging for testSnapshotAndRestore backward compatibility test
Fixed a request headers bug in transport client

Where the configured request headers were not sent with sniffing requests (both node/info & cluster state sniffing)
Fix failed engine exception logging
Aggregations: Make the list of buckets for terms and histogram returned as a java.util.List.

The terms and histogram aggregations always have an order. So it would make the
response easier to consume to return the buckets as a list instead of a
collection in order to make it easier to do things like getting the first/last
buckets.

Close #7275
Build: Changed license header definition file xml encoding to UTF-8
[TEST] fix to wildcard_expansion tests to wait for green status
Mapping: Fixes using nested doc array with strict mapping

Closes #7304
Docs: Added tables for directory locations for deb+rpm and zip+tar.gz installs

Closes #6508
Typo
Update search-template.asciidoc

Remove extra commas in template query ;-)

Closes #7033
Docs: Updated typo in getting-started.asciidoc

A very small typo in the description.

Closes #7134
Update repositories.asciidoc

Added apt-get update to the commands for clarity.

Closes #7192
Docs: Fix minor typo in readme

Closes #7195
Docs: Fix typo in phrase-suggest.asciidoc

Closes #7262
Docs: Remove phrase duplication in api-conventions.asciidoc

Closes #7263
Docs: Remove the 'Factor' paragraph to reflect #6490

The current implementation of 'date_histogram' does not understand
the `factor` parameter. Since the docs shouldn't raise false hopes,
I removed the section.

Closes #7277
Docs: Update snapshots.asciidoc

Added a link so you directly get to the page that tells how to open/close an index.

Closes #7286
Docs: Fix ambigous explanation of the "fields" parameter in `query_string` query

Closes #7292
Docs: Update nested-filter.asciidoc

Fix whitespace to standardize on spaces for indents on both code examples for readability.

Closes #6568