Running the loader a 2nd time breaks when running against a cloud managed cluster (elastic.co)

[MilesNorton]

I have an elasticsearch managed cluster on elastic.co. When I run the loader function for the first time it runs but then when i run it again it breaks with following error:

ResponseError: parse_exception: [parse_exception] Reason: mix of settings map and top-level properties
    at onBody (/home/miles-karmo/Projects/addressrio/node_modules/@opensearch-project/opensearch/lib/Transport.js:426:23)
    at IncomingMessage.onEnd (/home/miles-karmo/Projects/addressrio/node_modules/@opensearch-project/opensearch/lib/Transport.js:341:11)
    at IncomingMessage.emit (node:events:525:35)
    at endReadableNT (node:internal/streams/readable:1359:12)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21) 

At the moment I need to drop the index and re-sync everything which takes time since I won't be able to run the loader function per state as well.