This is designed to be a self answering question based on our experience.
We've configured indexer clustering with a replication factor and search factor of 2:2. Now all of my searches are showing duplicate data. What's up?
In our case we hadn't configured the search head to point to the clustermaster. The search peers were still all of our indexers which were happily showing both copies of the data. An edit to the server.conf and removal of the individual search peers and we were back in business. At any rate something to keep in mind.
http://docs.splunk.com/Documentation/Splunk/6.2.5/Indexer/Configuresearchheadwithserverconf
In our case we hadn't configured the search head to point to the clustermaster. The search peers were still all of our indexers which were happily showing both copies of the data. An edit to the server.conf and removal of the individual search peers and we were back in business. At any rate something to keep in mind.
http://docs.splunk.com/Documentation/Splunk/6.2.5/Indexer/Configuresearchheadwithserverconf