Index_already_exists_exception while updating analyzer setting of existing index

I am trying to update analyzer of existing index.
For that i have followed following steps -
1.Close index
curl -X POST "http://server/index_name/_close"

  1. Update setting:
    curl -XPUT 'http://server/index_name' -d '{
    "settings" : {
    "analysis": {
    "analyzer": {
    "danish": {
    "type": "danish"

But its throwing error
{"error":{"root_cause":[{"type":"index_already_exists_exception","reason":"already exists","index":"index_name"}],"type":"index_already_exists_exception","reason":"already exists","index":"index_name"},"status":400}

How to update analyzer setting of existing index?

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