Ingest attachment search with multi match query

Does it possible to use multi match query with attachment content?
Content store as base64_encode. When i use http://search-elastic.test:9200/elasticsearch_attachments_index/_search?q=calford&pretty=true its working fine but when i use to search with multi match query its not working.

Thanks for help.

Welcome!

Can you share a document that has been indexed?
Can you share the exact query you are running?
Can you share the mapping?

Hi dadoone,

Thank you for reply.
But i fix it. I was query to content but it need to query attachment.content.
So its working now.

Thanks you.