title: How do you reference a specific recipe revision from conan-index?
body: <p>I need to reference <a href="https://conan.io/center/spdlog?version=1.7.0&amp;revision=1eebff2f51d90cb700b63c6d2449ebcb&amp;tab=recipe" rel="nofollow noreferrer">spdlog 1.7.0 revision 1eebff2f51d90cb700b63c6d2449ebcb</a>, not the latest revision, but I cannot seem to do this. Specifying revision requires the <a href="https://docs.conan.io/en/latest/versioning/revisions.html" rel="nofollow noreferrer">user/channel#REV syntax</a>, but recipes on conan index <a href="https://stackoverflow.com/questions/59143781/missing-user-and-channel-fields-in-google-benchmark-conan-package">doesn't seem to have user/channel</a>.</p>
  <p>How do I reference a specific revision from conan-index?</p>