Content-Type header [application/x-www-form-urlencoded] is not supported on Elasticsearch

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To fix this, add curl option -H 'Content-Type: application/json'

This error is due to strict content-type checking introduced in ElasticSearch 6.0, as explained in this post

Starting from Elasticsearch 6.0, all REST requests that include a body must also provide the correct content-type for that body.

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