should "val at released request" be a debug level message rather than warn

[kajtzu]

We recently upgraded from 0.4.4 to 0.5.2 and noticed that our logs fill up with messages like the following:

2021-07-09 11:21:41[warn][23159][main]val at released request 22908064, idx 1
2021-07-09 11:21:41[warn][23159][main]val at released request 22908064, idx 3

Is there from a developer perspective any objection to changing the following log message from level warn to level debug? Or is it an indication that we are using nginx-clojure wrong as we seem to get a lot of these ;)

nginx-clojure/src/java/nginx/clojure/java/NginxJavaRequest.java

Line 198 in 5b37e20

NginxClojureRT.getLog().warn("val at released request %s, idx %d", r, i);

[xfeep]

It seems there are some invalid access to those closed requests.