Update keyword.asciidoc

`ignore_above` doesn't apply to analyzed `text` fields

docs/reference/mapping/types/keyword.asciidoc

@@ -62,7 +62,7 @@ The following parameters are accepted by `keyword` fields:
 
 <<ignore-above,`ignore_above`>>::
 
-    Do not index or analyze any string longer than this value.  Defaults to
+    Do not index any string longer than this value.  Defaults to
     `2147483647` so that all values would be accepted.
 
 <<include-in-all,`include_in_all`>>::