DO NOT MERGE Add back Yenta experiment (1/2)

This reverts commit b7257d86f2d99ad2db6fee9f4d665db07e27f9b5.

Test: enable yenta experiement and do a few searches
Bug: 33387897
Change-Id: I34bec0c7820e8d32c53bb8ac42b24787e4dc03b5
5 files changed