* stable-2.16:
Load proto_library from @rules_proto//proto:defs.bzl
Update git submodules
Bazel: Add fixes for --incompatible_load_{java|python}_rules_from_bzl
Bazel: Bump minimum supported version to 0.29.0
Lucene index configuration and docs.
Change-Id: I401c192096047dd5069be37f17c4a62a8ed3afb7