* master: (192 commits)
[TEST] Fix rare OBOE in AbstractBytesReferenceTestCase
Reindex from remote
Rename writeThrowable to writeException
Start transport client round-robin randomly
Reword Refresh API reference (#19270)
Update fielddata.asciidoc
Fix stored_fields message
Add missing footer notes in mapper size docs
Remote BucketStreams
Add doc values support to the _size field in the mapper-size plugin
Bump version to 5.0.0-alpha5.
Update refresh.asciidoc
Update shrink-index.asciidoc
Change Debian repository for Vagrant debian-8 box
[TEST] fix test to account for internal empyt reference optimization
Upgrade to netty 3.10.6.Final (#19235)
[TEST] fix histogram test when extended bounds overlaps data
Remove redundant modifier
Simplify TcpTransport interface by reducing send code to a single send method (#19223)
Fix style violation in InstallPluginCommand.java
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