Merge branch 'stable-2.16'

* stable-2.16:
  Fix index creation when using MySQL
  Upgrade bazlets to latest stable-2.16 to build with 2.16.1 API
  Bazel: Include eclipse-out directory in .bazelignore
  Add explanatory comment to empty BUILD file(s)

Change-Id: Ie8b952b296285f9f72d112e10b1cfef288403e2e