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Elasticsearch provider can claim items from queues by larger units and after changing queue items status they are sent back to Elasticsearch as a bulk unit. By this technique we can achieve better performance.  We can configure claim unit size parameters based on the current Aspire installation (e.g. standalone/ distributed mode, etc.). This is how it works:

• Pre-fetch Prefetch "claimPrefetch" number of queue items of status "available". The default value is 10 000.
• Take randomly random set of size "claim" number of items from the above pre-fetched set. The default value is 10 000.
• Change the status of all "claimed" items from "available" to "inProgress" and sent this as a bulk update request to Elasticsearch.
• Examine the result of the bulk request. All successfully updated items with no version conflicts can be sent one by one as a result of bulk claim to the connector framework.

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