97a01dbb05
The line of what was a "dry run" was a bit arbitrary, doing all the Gerrit processing (including potential side effects like writing to persistent caches) but not all the index-specific processing, which could still be useful for evaluation or debugging purposes. Instead, provide an output base so administrators can test the indexing behavior without operating on production index data. For Lucene, this flag is interpreted as a path to the index directory; for Solr, it is a prefix added to the collection names. Change-Id: Ic4808d1e3467a780a818ac7d1c89de13610da630