How to change the Elasticsearch Indices name

We use the same Elasticsearch node for multiple indexes. The FileRun 'files' conflicts with an existing index from a different area of our website. How may I change the index name name to something else? 

# curl -X GET 'http://elasticsearch.example.com:9200/_cat/indices?v'

health status index
green open files

Hopefully there is a configuration override we can set to have FileRun use a name other than 'files'?

Thank you.