GoogleApi.Datastore.V1.Connection.head-exclamation-mark

You're seeing just the function head-exclamation-mark, go back to GoogleApi.Datastore.V1.Connection module for more information.
Link to this function

head!(client, url, opts)

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Specs

Perform a HEAD request.

See request!/1 or request!/2 for options definition.

head!("/users")
head!("/users", query: [scope: "admin"])
head!(client, "/users")
head!(client, "/users", query: [scope: "admin"])
head!(client, "/users", body: %{name: "Jon"})