anchor.diff:      "functions": [
           {
               "filter": {},
  -            "FUNCTION": {},
  +            "FUNCTION": {}, <1>
               "weight": number
           },
           {
  -            "FUNCTION": {}
  +            "FUNCTION": {} <1>
           },
           {
               "filter": {},
  
positive.code: sets the score to 0 if the field value exceeds twice the user given
  scale value.
  
  ===== Multiple values:
  
  If a field used for computing the decay contains multiple values, per default the value closest to the origin is chosen for determining the distance.
  This can be changed by setting `multi_value_mode`.
  
negative.code: }
  --------------------------------------------------
  
  [[function-field-value-factor]]
  ==== Field Value factor
  
  The `field_value_factor` function allows you to use a field from a document to
  influence the score. It's similar to using the `script_score` function, however,
  