How are these fields created?

I have an elasticsearch 5.5 index that has 2 fields: percentl50 and percentl90. I try to find how do we generate these fields and found no way they can get data. No application is writing data into those fields, they just appear out from somewhere. How do I find how those fields were created? These fields contain percentiles data.

The fields will automatically be created if any documents contain or at one point contained those fields. Once the field exists in the mappings you'll have to re-create the index to get rid of it.

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