If indexing goes wrong, the failure is typically logged. But we do not explicitly say when re-indexing gave a ready index. One has to resort to double-checking `index/gerrit_index.config` the index state after every re-index. So, we now explicitly report the index state after re-indexing. Change-Id: Idbf8c728a33e2753ee7528dc76f6095f407d3a05