Problem: An index service entry has AggregatorConfig data but an empty AggregatorData entry.

Solution: There is probably something wrong with the registration. For example, a registration that uses QueryAggregatorSource aggregator source may have incorrect values for the resource's hostname or port number or a misspelled resource property name, or the remote resource may impose security restrictions that prevent the queries from the index from working. You can use the standard toolkit resource property query tools (such as wsrf-get-properties) to verify that the remote resource is responding.