MNT : remove 'time_as_datetime' from dynamic documents
MNT : remove 'time_as_datetime' from dynamic documents

As part of never documenting it is available

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