class_docstr: Matches documents containing a given phrase.
code: def estimate_min_size(self, ixreader):
      return self._and_query().estimate_min_size(ixreader)
  
imports: from __future__ import division
  import copy
  from whoosh import matching
  from whoosh.analysis import Token
  from whoosh.compat import u
  from whoosh.query import qcore, terms, compound
label_desc: Use image node_id 13 for calling the Phrase obj's underlying member method code with example usage: obj.estimate_min_size(ixreader) and returns: self