Merge branch 'stable-2.14'
* stable-2.14:
CacheEvictionIT: Re-enable and adapt to use @GlobalPluginConfig
Migrate plugin config to own configuration file
Disallow DELETE when index does not support delete
Factor common code out of Index*RestApiServlet classes
Forward group indexing event
Index{Account,Change}RestApiServlet: Use UTF_8 constant
Revert "Ignore flaky CacheEvictionIT"
Ignore flaky CacheEvictionIT
IndexAccountRestApiServlet: Remove unnecessary semicolon
Change-Id: If56525eae31484d17cf59b2eb0ff324b7e8524be