anchor.diff:           default value of 3 is used to provide a minimum weight-of-evidence.
   
   
  -==== Filtering Values
  +===== Filtering Values
   
   It is possible (although rarely required) to filter the values for which buckets will be created. This can be done using the `include` and
   `exclude` parameters which are based on regular expressions. This functionality mirrors the features
  
positive.code: aggregation that later discards many candidate terms. It is advisable in these cases to perform two searches - the first to provide a rationalized list of
  significant_terms and then add this shortlist of terms to a second query to go back and fetch the required child aggregations.  
   
  ==== Approximate counts
  The counts of how many documents contain a term provided in results are based on summing the samples returned from each shard and
  as such may be:
  
  
negative.code: NOTE:   `shard_size` cannot be smaller than `size` (as it doesn't make much sense). When it is, elasticsearch will
          override it and reset it to be equal to `size`.
  
  ===== Minimum document count
  
  It is possible to only return terms that match more than a configured number of hits using the `min_doc_count` option:
  
  