Automatically deleting all data of only particular one index and re initiating with same data

Hi All,
In project using elastic search version 6.5.0 with single node. In elastic search particular one index automatically deleting all the data of index and after some time again deleted data coming back to index automatically with out doing anything. mean wile data issue are coming in project. so this issue happening time productivity going down in project. i dont know why its happening, i check the logs also. i am not getting anything.
please help me out of this problem,

Unless you have setup an ILM policy to explicitly delete indices, Elasticsearch will not do this itself. So something else must be asking for it to be deleted. How does the data get into Elasticsearch?

You should upgrade to 6.8 (or 7.X) and get free Security, to limit access and protect your data -

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