isahc: failed to write response body because the response reader was dropped

When doing a lot of very similar requests, occasionally i will get logs like this:

[WARN] failed to write response body because the response reader was dropped

I know these are just warnings, but I’m currently debugging a tricky problem and I’d rather be sure about what is happening. Why are these warnings happening, and is there any way to prevent them?

Here’s the code in question:

    let response = isahc::http::Request::put(format!("{}/links/_bulk", opt.elastic_url))
        .header(CONTENT_TYPE, "application/json")
        .authentication(Authentication::basic())
        .credentials(Credentials::new("elastic", opt.elastic_pass.clone()))
        .body(body.to_string())?
        .send()?;
    if !response.status().is_success() {
        let mut buffer = String::new();
        response.into_body().read_to_string(&mut buffer)?;
        error!("Got non-success status code, response was\n {}", buffer);
    }

Is this perhaps due to into_body consuming the response?