Embodiments of the present disclosure provide a method for performing search queries. The method comprises transmitting a list of active indexers in an indexer cluster from a cluster master for receipt by a first search head, wherein the cluster master is communicatively coupled with an indexer cluster comprising a plurality of indexers and the first search head. The method further comprises receiving a first slot request at the cluster master in response to a query from the first search head, wherein the first search head is operable to transmit the query to the active indexers for execution if granted the slot request. Further, the method comprises evaluating a plurality of policies to determine if the first slot request can be granted and responsive to a positive determination, transmitting an authorization token for a slot to the first search head.