Why am I gettin the warning "Restricting results of the "rest" operator to the local instance because you do not have the "dispatch_rest_to_indexers" capability."

Since we upgraded from Splunk 6.5.3 to 7.0.3 we are getting the following warning: REST Processor: Restricting results of the "rest" operator to the local instance because you do not have the "dispatch_rest_to_indexers" capability. The relevant part of the search is | rest splunk_server=local /services/authentication/current-context | fields username According to the Search Reference , splunk_server=local should restrict the search to the search head - so this behavior is intentional. Why am I getting this warning? Can I somehow suppress it?