Use analyzer on existing index field to extract keywords


I am looking to apply language analyzer to an existing index which i have created in elastic. can anyone suggest how i can mention the index column in the text field instead of static text currently i am trying with this URL

curl -XGET http://localhost:9200/mailindex/_analyze?analyzer=english -d "{"field" : "columnname","text" : "This is a test"}"

and once it is extracted the tokens can we update back the same index or needs to be created in new one?

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