Fix misleading error message in tests BreakerTestUtil (elastic#136069) (elastic#136080)

Author: afoucret

test/framework/src/main/java/org/elasticsearch/test/BreakerTestUtil.java

@@ -53,7 +53,7 @@ public static <E extends Exception> ByteSizeValue findBreakerLimit(ByteSizeValue
         try {
             c.accept(onePastLimit);
         } catch (CircuitBreakingException e) {
-            throw new IllegalArgumentException("expected runnable to break under a limit of " + onePastLimit + " bytes");
+            throw new IllegalArgumentException("expected runnable to *not* break under a limit of " + onePastLimit + " bytes");
         }
         return limit;
     }