release [1.3.6]
Updated docs to use v1.3.6 as current
Prepare for next development iteration (1.3.7-SNAPSHOT)
top_hits aggregation: Fail with a parse exception if `top_hits` agg is defined under a `nested` agg.

Closes #8668
Closes #8673
Test: predefine sort fields in mapping, otherwise during the test the field may not be found if it were to be introduced dynamically at index time.
Test: CorruptedFileTest.testCorruptionOnNetworkLayer used node settings when creating an index

Test used `indices.recovery.concurrent_streams` when creating an index but this is a node setting. Moved it to the node settings and added similar settings to speed up concurrent recoveries.
Docs: Additional info about _score calculation

Description taken from http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/multi-query-strings.html / 110_Multi_Field_Search/05_Multiple_query_strings.asciidoc

Closes #8635
Update daterange-aggregation.asciidoc

Clarified the date-math expressions on date range aggregations

Closes #8703
[TESTS] Fix NPE in FreqTermsEnumTests.
Docs: Grammar correction

Closes #8702
[TEST] Ensure that all flushes happen on PeerRecovery tests
Fixing typo

Closes #8713
[TEST] Ensure we have a mapping for all types on open/close

Conflicts:
	src/test/java/org/elasticsearch/search/basic/SearchWithRandomExceptionsTests.java
Typo in error message with too few points for geo polygon filter.

Closes #8767
Docs: Added a command to start elasticsearch on bootup on Debian.

Close #8600
Docs: Add instructions to start elasticsearch on bootup on RHEL/Fedora.
[TEST] wait unitl all machines joined the cluster
Add TRACE logging to translog operations
docs: add pgp key to repositories page
Docs: use https to download the gpg public key

Closes #8818