'Use of wrong HTTP verb while creating elasticsearch index

To create an index in the elasticsearch, we need to use the PUT verb, for example, the following command:

curl -X PUT "localhost:9200/test_index" -d '{"settings":{"number_of_shards":2, "number_of_replicas":2}}' --header 'Content-Type: application/json'

But according to RFC 2616, § 9.5, POST can be also used to create a resource.

Why POST is not suitable here or why did elasticsearch designer use PUT instead of POST?

post put http-protocols

Solution 1:^[1]

I found some posts related to your question. This answer from one of the ElasticSearch engineers might be helpful to you.

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Solution	Source
Solution 1	andrecoelho.rabbitbr