remove bloom from clear cache API, add id_cache

docs/reference/indices/clearcache.asciidoc

@@ -10,7 +10,7 @@ $ curl -XPOST 'http://localhost:9200/twitter/_cache/clear'
 --------------------------------------------------
 
 The API, by default, will clear all caches. Specific caches can be
-cleaned explicitly by setting `filter`, `field_data` or `bloom` to
+cleaned explicitly by setting `filter`, `field_data` or `id_cache` to
 `true`.
 
 All caches relating to a specific field(s) can also be cleared by