Full-text search resiliency

Full-text indexing is more resilient in this release.

To help ensure that full-text searches find recent updates, on both client and server, documents with un-indexed changes are indexed before searching. Up to 200 documents can be indexed before searching; additional documents are queued for immediate indexing.
If a corrupted index is found during indexing or searching, on both client and server, the index is queued to be rebuilt.