* stable-2.16:
Upgrade elasticsearch-rest-client to 7.3.2
Add deleteChanges to list of supported permissions
Remove obsolete permissions from gr-access-behavior
Update git submodules
Update git submodules
Allow admins to index a change even if the branch is not Readable for them
Change-Id: I2d1b92e6895f43ab55b48ae3dca3260d87a26971