Add freq index.
Determine and keep updated approxdoc count as indexing occurs.
Add termsDebug method for debugging term hashing.
Broader searchfield handling.
ENV var for skipping grid indexing.
Optimize term index based on significant term detection.
Use previously generated termsets for speed.
Stopgap approxdocs handler.
Updates for S3 backend.
Merge branch 'dev' into dev-nogyp