When creating any index, the index stanza must be added to the indexes.conf on all indexers by way of the cluster master in a clustered environment or manually on each indexer in a non-clustered environment. Assuming, of course, the search head is not indexing locally and forwarding its data to the indexers.
If you have proper permissions and the search head is not indexing locally, you should see an error similar to the one below in _internal or the Messages drop-down within the web UI. The warning would be reported by each indexer that receives the summary index data for an index not configured.
Received event for unconfigured/disabled/deleted index=<-index-> with source="<-source->" host="<-host->" sourcetype="<-sourcetype->". So far received events from 'X' missing index(es).
Managing indexes:
http://docs.splunk.com/Documentation/Splunk/6.5.2/Indexer/Setupmultipleindexes
Peer configuration:
http://docs.splunk.com/Documentation/Splunk/6.5.2/Indexer/Configurethepeerindexes
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