documentation of preserve existing settings
Change specific index level settings in real time.
The REST endpoint is `/_settings` (to update all indices) or
-`{index}/_settings` to update one (or more) indices settings. The body
-of the request includes the updated settings, for example:
+`{index}/_settings` to update one (or more) indices settings.
+The body of the request includes the updated settings, for example:
[source,js]
--------------------------------------------------
@@ -21,6 +21,8 @@ PUT /twitter/_settings
The list of per-index settings which can be updated dynamically on live
indices can be found in <<index-modules>>.
+To preserve existing settings from being updated, the `preserve_existing`
+request parameter can be set to `true`.
[float]
[[bulk]]
