Epoch Nano Custom Date Format

It appears that Elasticsearch does not currently support epoch nano. It is an open issue so you may want to contribute to the discussion on GitHub.

https://github.com/elastic/elasticsearch/issues/10005

https://discuss.elastic.co/t/increase-the-resolution-of-elastic-timestamps-to-nanoseconds/24227

https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html#custom-date-formats