Hello, I'm asking your help to merge two indexes. The first index is simply JSON documents compound. The second index is made up of JSON documents too but with array of documents. For example: First index { "field1": "value1", "field2": "value2", } Second index    { ...other fields... documents: [{ "field1": "value1" "field2": "value2" }, { "field1": "value1" "field2": "value2" }] }   I want to be able to retrieve and flatmap documents from the second index and then merge it with the first index to be able to do stats operations. Thank you  ... View more