Hi @jfer, it seems you have deleted all the details from question template here on the forum, so I am not not quite sure what exactly might be happening here.
Could you share some additional information around the issue you are seeing? Which version of ES are you using and how exactly do your documents look like? Which version of n8n are you using and which operation of the Elasticsearch node are you using?
In general, if you have your operation working outside of n8n, you could always use the HTTP Request node to send a specific request to the Elasticsearch REST API.