Change-Id: I1f6b7ed199faf4c8f3a3932731507c18413ad6e6
This will be used for deep category search implementation, also Wikibase one in repo/maintenance will be changed to use the same codebase. Bug: T185127 Change-Id: Ie8dd4a5aff55d90f02426f1430ed5214c7327bbc