Change back to debug from warning, overflowing the logs

Src/java/engine/src/main/java/org/opencds/cqf/cql/engine/elm/executing/FunctionRefEvaluator.java

@@ -103,7 +103,7 @@ private static FunctionDef getResolvedFunctionDef(State state, final String name
         }
 
         if (candidateDefs.size() > 1 && !hasSignature) {
-            logger.warn(
+            logger.debug(
                     "Using runtime function resolution for '{}'. It's recommended to always include signatures in ELM",
                     name);
         }