Elasticsearh update nested fields (array arrays). How do I copy a (index) to the new index to update by query a nested fields data for elasticsearch based on the query criteria?

GET usernested/_search{  "query": {    "nested": {      "path":"tags",      "query": {        "bool": {          "must": [            {              "term": {                "tags.brandid":"93a8296c-5b64-49ea-bd92-b19192def2e9"              }            },            {              "term": {                "tags.site":"163"              }            }]}}}}}//create A new index as the test data using post _reindex{"source": {    "index":"usernested",    "query": {      "nested": {        "path":"tags",        "query": {          "bool": {            "must": [              {                "term": {                  "tags.brand":"c55fd643-1333-4647-b898-fb3e5e4e6d67"                }              },              {                "term": {                  "tags.site":"163"                }              }            ]          }        }      }    }  },  "dest": {    "index":"new_usernested"}}//query Get new_usernested/_search{  "query": {    "nested": {      "path":"tags",      "query": {        "bool": {          "must": [            {              "term": {                "tags.brand":"c55fd643-1333-4647-b898-fb3e5e4e6d67"              }            },            {              "term": {                "tags.site":"163"}} ]}}}}}//update a nested document get usernested based on the condition/_update_by_query{  "query": {    "nested": {      "path":"tags",      "query": {        "bool": {          "must": [            {              "term": {                "tags.brand":"c55fd643-1333-4647-b898-fb3e5e4e6d67"              }            },            {              "term": {                "tags.site":"163"              }            }          ]        }      }    }  },  "script": {    "inline":"for (e in Ctx._source.tags) {e.brand = ' test2 ';}"//update nested field
//"inline": "ctx._source.userid = ' TestID '"//update normal field}}

Elasticsearh update nested fields (array arrays). How do I copy a (index) to the new index to update by query a nested fields data for elasticsearch based on the query criteria?