Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  WebAppInitializer: Move plugin modules loading to after the index one
  De-couple online reindex activation from index module
  Revert "Fix online reindexing for plugins-dependent rules"

Change-Id: Iddd0dc1ff529a950c660a510a1affac7cc61f4a2
tree: 1ee7e43e7e5c21a92845ef3300f031e07dcb6a6d
  1. java/
  2. javatests/