tweak parameters to enhance reindex performance

• Use max 'limit' param value (1000) to fetch record-ids from Storage for kind.
• Batch 1k record-ids to 50 (same limit as Storage PUT API record-changed event).

With these changes, we see 5x performance improvements on reindex API.

changed milestone to %M17 - Release 0.20

added Azure label

requested review from @sabarishk

approved this merge request

approved this merge request

mentioned in commit 29fe5811

merged

mentioned in issue #66