* stable-2.15:
Fix binding of VersionManager
Document gerrit#serverId configuration in gerrit.config
Release 2.15.1
GerritServerId: Update comment for correct location of server Id
Index{Activate,Start}Command: Include name in error message when unknown
Index start/activate command: fix unknown name use
Index start/activate commands: fix Elastic support
Change-Id: I9ad569c653b9f14a33c3da008685d5a96abd2348