* stable-2.15:
AbstractQueryChangesTest#createInjector: Remove unnecessary 'throws Exception'
Fix copyAllScoresOnMergeFirstParentUpdate's documentation
Release 2.15.2
Acceptance tests: Remove ES bootstrap boilerplate
AbstractQueryProjectsTest and ElasticQueryProjectsTest are adapted to
the changes done in I57e5d0718 ("Acceptance tests: Remove ES bootstrap
boilerplate").
Change-Id: I09d583eb1115981ac8fa0e1e3fedec16cf9555f7