HTTPD Redirect Rule as Proxy is giving me file not found error. How do I proxy to an external url?

I have a reverse proxy to AWS Elasticsearch. I am having issues with using RedirectRule: no matter what I try, my URL is being interpreted as a file. SSLProxyEngine On ProxyRequests On ProxyPreserveHost On RewriteEngine On RewriteRule /test-api https://vpc-cls-elasticsearch-test-tmqu2s2mcftvsuqe.amazonaws.com [P] ProxyPassReverse /test-api https://vpc-cls-elasticsearch-test-tmqu2s2mcftvsuqe.amazonaws.com Calling https://example.com/test-api always returns this error: The requested URL /cls-api was not found on this server How can I get this to work without the existence of an actual file on my server?