Attachment processor in elasticsearch failing to process base64 content

https://www.elastic.co/guide/en/elasticsearch/plugins/master/using-ingest-attachment.html
The abovelink tells us a method to process base64 format content and use plugins to extract string content.

I am using postman for this process. I have installed ingest attachment to elasticsearch. My query stops at loading the query. What can be the issue here?

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