I have several little sites that use the Mastodon API just sitting unfinished. Here's one that attempts to put a user friendly UI on the advanced search (elasticsearch) options if your server supports it.

"If your server supports it" is where I'm stuck. There's no /api/vX/instance or nodeinfo fields that identify if the server has it enabled.

A login is required to test for it...so I have to ask the user to login, then tell them LOL NO JK your instance doesn't support this.

Screenshot of a Mastodon interface showcasing the "Advanced Search" feature. The section includes options for searching "All," "Images," "Videos," "Links," and "Polls." A recent post titled "Your Dog Will Love This Anxiety-Busting Cuddle Companion" is displayed, along with user handles and timestamps.
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If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/box464/statuses/114322926371665474 on your instance and quote it. (Note that quoting is not supported in Mastodon.)