internal error when response is too large

Ex: GET visitors will return an internal service error when the response is around 750 docs unless the results are thinned through the $select param

Reproduce the GET visitors request with around 750 documents, both with and without the $select parameter. Trace the response handling to identify why the larger response becomes an internal service error. Done means the request succeeds at the reported size and existing response behavior remains intact.

Written by the indexing model from the issue text.