Add the Ability to Index a Field when Writing to an ESRI File GeoDatabase.

[jacob_barlow]

I appreciate being able to write to an ESRI File GeoDatabase. It would be even better if in the process of writing to an ESRI File GeoDatabase I could identify fields to index and have them indexed when writing to the File GeoDatabse. Currently I have to add the index in ArcGIS after the fact. Writing to an ESRI File GeoDatabase currently adds a spatial index automatically, but I'm talking about an attribute index here.