Index pattern timeFieldName is getting changed when using CURL command for creation

I have a bash script which creates index-pattern using the below curl command and after that http_poller_plugin is run.

" curl -X POST 'localhost:5601/api/saved_objects/index-pattern/lucy_data'  -H 'kbn-xsrf: true'  -H 'Content-Type: application/json' -d'
  \"attributes\": {
\"title\": \"lucy_data\",
\"timeFieldName\": \"created_at\"

Now, the issue comes, when i run this script, the index-pattern is created using timeFieldName: created_at values and initially everything is working fine when i apply date-time filter and after sometime when i checked the date-time filter again, it was not working as it was before. So i have checked in Management> index-patterns and the timeFieldName value got changed to @timestamp.

How is this happening? I have not changed anything or added data at least.

Is this expected behaviour when using the CURL command to create index-pattern or indices created with "name" instead of uuid?

The only process that regularly updates index patterns at all is when clicking on fields in Discover, where we update the field popularity. I suspect that the issue here is that you are creating an index pattern without also telling the index pattern about the created_at field, something like this:

  "attributes": {
    "title": "lucy_data",
    "timeFieldName": "created_at",
    "fields": '[{"name":"created_at","type":"date","esTypes":["date"],"count":0,"scripted":false,"searchable":true,"aggregatable":true,"readFromDocValues":true}]'

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