Abstract API that produces terms, doc, freq, prox, offset and payloads postings.
Checks consistency of this reader.
Returns an iterator that will step through all fields names. This will not return null.
Returns the number of fields or -1 if the number of distinct field names is unknown. If >= 0, .iterator will return as many field names.
Get the Terms for this field. This will return null if the field does not exist.