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Message search is built-in to the chat API. You can enable and/or disable the search indexing on a per channel type. The command shown below selects the channels in which John is a member. Next, it searches the messages in those channels for the keyword “'supercalifragilisticexpialidocious'”:
Pagination works via the standard
offset parameters. The first argument, filter, uses a MongoDB style query expression.
Additionally, this endpoint can be used to search for messages that have attachments.