anchor.diff:  {
     "expected_attendees" : { <2>
       "gte" : 10,
  -    "lte" : 20
  -  },
  -  "time_frame" : { <3>
  -    "gte" : "2015-10-31 12:00:00", <4>
  +    "lt" : 20
  +  },
  +  "time_frame" : {
  +    "gte" : "2015-10-31 12:00:00", <3>
       "lte" : "2015-11-01"
     }
   }
  
positive.code:         "_score" : 1.0,
          "_source" : {
            "expected_attendees" : {
              "gte" : 10, "lte" : 20
            },
            "time_frame" : {
              "gte" : "2015-10-31 12:00:00", "lte" : "2015-11-01"
  
negative.code: <titleabbrev>Range</titleabbrev>
  ++++
  
  Range field types represent a continuous range of values between an upper and lower
  bound. For example, a range can represent _any date in October_ or _any
  integer from 0 to 9_. They are defined using the operators
  `gt` or `gte` for the lower bound, and `lt` or `lte` for the upper bound.
  They can be used for querying, and have
  limited support for aggregations. The only supported aggregations are
  {ref}/search-aggregations-bucket-histogram-aggregation.html[histogram],
  {ref}/search-aggregations-metrics-cardinality-aggregation.html[cardinality].
  
  The following range types are supported:
  
  [horizontal]
  