Update plugins.asciidoc

Added Vietnamese Analyser to plugins page

Closes #6647
Eclipse: do not use star imports and reorganize imports on save.

Close #7587
Mappings: Store _timestamp by default.

Storing `_timestamp` by default means that under the default configuration, you
would have all the information you need in order to reindex into a different
index.

Close #8139
Search: Remove partial fields.

Partial fields have been deprecated since 1.0.0Beta1 in favor of _source
filtering. They will be removed in 2.0.
Test: RelocationTests.testMoveShardsWhileRelocation should wait on nodes to start before asking for a client

The client call may create another node if none of the previous nodes are published. That node throws the test off.
Raise maximum index name length to 255 bytes

Fixes #8079