[fix]lower wait between retries waiting for threads to close #1907
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When a batch stream exits, it hits this check. If a batch did not have a number of elements that exactly matched the batch size the client chose, it would leave a batch thread a live very briefly, and would trigger this wait even though the thread was about to close. This lead to situations where submitting 99 objects in a batch would actually be slower(by about 1 second) than submitting 100 objects.
Lowering this wait means that we do our second check for live threads much more quickly, and so we wait on the client process for .05 seconds instead of 1 second. Testing with Locust confirms this performance improvement.