Can _search_with_cluster also cluster the result if content is of type "attachment"?

You won't be able to cluster the base64 encoded string directly. But, if you specify "fields" when firing your query, you will be able to do that. Please have a look at the following gist:


You will now be able to use files.file when clustering your result. However, if you have an array of attachments, it will treat all the files as a single file when clustering. Only way we can access them as array is through _source, which again will only return base64 encoded string. Not sure how to get around this issue. But for single files, using "field_mapping": { "title":[fields.files.file"]} should work. Let me know how it goes.

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