Full text search multi match over multiple indies

I want to do full text search over multiple indies. For each index, I want query search over some fields not all and put these fields in multi-match's fields option.
My indies have some same field names so I want to separate it by include index name or doc name such as I set fields option like [index_name.doc_name.field_name or doc_name.field_name], but it return no result. It only has result when fields option set only field name.

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