anchor.diff:  |======
   | Name                   | Required  | Default                      | Description
   | `field`                | yes       | -                            | The field to get the date or timestamp from.
  -| `index_name_prefix`    | no        | -                            | A prefix of the index name to be prepended before the printed date.
  -| `date_rounding`        | yes       | -                            | How to round the date when formatting the date into the index name. Valid values are: `y` (year), `M` (month), `w` (week), `d` (day), `h` (hour), `m` (minute) and `s` (second).
  +| `index_name_prefix`    | no        | -                            | A prefix of the index name to be prepended before the printed date. Supports <<accessing-template-fields,template snippets>>.
  +| `date_rounding`        | yes       | -                            | How to round the date when formatting the date into the index name. Valid values are: `y` (year), `M` (month), `w` (week), `d` (day), `h` (hour), `m` (minute) and `s` (second). Supports <<accessing-template-fields,template snippets>>.
   | `date_formats`         | no        | yyyy-MM-dd'T'HH:mm:ss.SSSZ   | An array of the expected date formats for parsing dates / timestamps in the document being preprocessed. Can be a Joda pattern or one of the following formats: ISO8601, UNIX, UNIX_MS, or TAI64N.
   | `timezone`             | no        | UTC                          | The timezone to use when parsing the date and when date math index supports resolves expressions into concrete index names.
   | `locale`               | no        | ENGLISH                      | The locale to use when parsing the date from the document being preprocessed, relevant when parsing month names or week days.
  -| `index_name_format`    | no        | yyyy-MM-dd                   | The format to be used when printing the parsed date into the index name. An valid Joda pattern is expected here.
  +| `index_name_format`    | no        | yyyy-MM-dd                   | The format to be used when printing the parsed date into the index name. An valid Joda pattern is expected here. Supports <<accessing-template-fields,template snippets>>.
   |======
   
   [[dissect-processor]]
  
positive.code: [options="header"]
  |======
  | Name       | Required  | Default  | Description
  | `message`  | yes       | -        | The error message of the `FailException` thrown by the processor
  |======
  
  [source,js]
  --------------------------------------------------
  {
    "fail": {
      "message": "an error message"
    }
  }
  --------------------------------------------------
  
negative.code:         "field" : "initial_date",
          "target_field" : "timestamp",
          "formats" : ["ISO8601"],
          "timezone" : "{{my_timezone}}",
          "locale" : "{{my_locale}}"
        }
      }
    ]
  