anchor.diff:  fail if you remove or update the field. For example, a bar chart visualization
   that uses a runtime field of type `ip` will fail if the type is changed
   to `boolean`, or if the runtime field is removed.
  -
   ****
   
   [[runtime-search-request]]
  
positive.code: }
  ----
  
  You can update or remove runtime fields at any time. To replace an existing runtime field, add a new runtime field to the mappings with the same name. To remove a runtime field from the mappings, set the value of the runtime field to `null`:
  
   [source,console]
   ----
   PUT my-index/_mapping
   {
     "runtime": {
       "day_of_week": null
     }
   }
   ----
  
  [[runtime-updating-scripts]]
  .Updating and removing runtime fields
  ****
  
  Updating or removing a runtime field while a dependent query is running can return
  inconsistent results. Each shard might have access to different versions of the
  script, depending on when the mapping change takes effect.
  
negative.code: runtime field from a search request to the index mapping by moving the field
  definition from `runtime_mappings` in the search request to the `runtime`
  section of the index mapping.
  
  [[runtime-override-values]]
  === Override field values at query time
  