Elasticsearch consuming space without even indexing?

I start elasticsearch server and I observe the index directory starts swelling, with in a couple of minutes it reaches to few GBs, without even ingesting a single document.
I suspected some other es client to be ingesting so I changed the ports of my es server and node instances
specifically I changed
http.port to 9277 and transport.tcp.port to 9377 .
Even after this the same thing is happening, I am clueless about what's happening??

What gives:

GET _cat/indices?v

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