ES Mapping - Alert in Predicate Editor

Context :

When users currently create a search based on a predicate that is a custom variable, that search will rely on the default mapping (For example Strings = Keyword) and hence won't work with most search operators 
 }{{"strings": {"mapping": {"type": "keyword","copy_to": "all_field","ignore_above": 256},"match_mapping_type": "string"}},

Designs :
As per 'Message in Predicate Editor page" 

https://www.figma.com/file/TKic9bHB2tuCkW4aveonak/NOS---Design?node-id=236%3A25090

To Do :

Add an alert in the Predicate Editor in PP under 'Field' 

"This field uses the default mapping, you may need to configure Elasticsearch mapping to use advanced search features View Documentation Here" 

Link to new Doc page