Clarify the defaults for `ignore_above`.
Closes
@@ -62,8 +62,10 @@ The following parameters are accepted by `keyword` fields:
<<ignore-above,`ignore_above`>>::
- Do not index any string longer than this value. Defaults to
- `2147483647` so that all values would be accepted.
+ Do not index any string longer than this value. Defaults to `2147483647`
+ so that all values would be accepted. Please however note that default
+ dynamic mapping rules create a sub `keyword` field that overrides this
+ default by setting `ignore_above: 256`.
<<mapping-index,`index`>>::
