Error changing type /mapping from object to nested

I am trying to change object type to nested by

PUT lfx2_lp_prices1/_mapping

    "properties" : {
        "NoMDEntries" : {"type" : "nested"}


But getting error
"type": "illegal_argument_exception",
"reason": "object mapping [NoMDEntries] can't be changed from non-nested to nested"

NoMDEntries in arrany of some currency prices.

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