MNT: Use fastest search for documents on their uid
MNT: Use fastest search for documents on their uid

- See http://nbviewer.ipython.org/gist/ericdill/ca047302c2c1f1865415

ericdill/databroker,hhslepicka/metadatastore,ericdill/databroker,tacaswell/metadataStore,hhslepicka/metadatastore,NSLS-II/metadatastore,arkilic/metadatastore,tacaswell/metadataStore,arkilic/metadatastore,NSLS-II/metadatastore