Update forcemerge.asciidoc (#30113)

Author: matijabruncic

docs/reference/indices/forcemerge.asciidoc

@@ -38,6 +38,12 @@ deletes. Defaults to `false`.  Note that this won't override the
 `flush`::  Should a flush be performed after the forced merge. Defaults to
 `true`.
 
+[source,js]
+--------------------------------------------------
+POST /kimchy/_forcemerge?only_expunge_deletes=false&max_num_segments=100&flush=true
+
+--------------------------------------------------
+
 [float]
 [[forcemerge-multi-index]]
 === Multi Index