Customer is receiving the following messages:
71] 20160417.163022.775 WARN : Rejecting persistent search - limit reached
 20160417.163355.727 WARN : Size limit exceeded
By default, max-op-size is set to 200 at .dxc.
Question: is there a formula that explains how-to calculate the number of Searches x Amount of RAM memory used by feature "Persistent Search"