When you map fields to use doc values for field data, does that limit the 
functionality afforded to those fields to merely sorting and 
aggregations/faceting?

The documentation mentions that filtering is not supported by numeric or string 
types when stored as doc values. Yikes, I thought that doc values is intended 
for working with field data when it's too large to load into memory. Is that 
not the case?

I read both of the following pages but I'm not sure I quite understand where 
the usefulness of field data fields kick in. 

http://www.elasticsearch.org/blog/disk-based-field-data-a-k-a-doc-values/
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/mapping-core-types.html

Can someone please clarify?

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