Ignore timestamp in redis, haproxy and system filebeat module (elasti…

…c#9855)

* Ignore timestamp in redis, haproxy and system filebeat module

* Fixing formatting

filebeat/tests/system/test_modules.py

@@ -178,6 +178,7 @@ def _test_expected_events(self, test_file, objects):
 
         for ev in expected:
             found = False
+            clean_keys(ev)
             for obj in objects:
 
                 # Flatten objects for easier comparing
@@ -204,7 +205,9 @@ def clean_keys(obj):
         delete_key(obj, key)
 
     # Remove timestamp for comparison where timestamp is not part of the log line
-    if obj["event.module"] == "icinga" and obj["event.dataset"] == "startup":
+    if (obj["event.module"] == "icinga" and obj["event.dataset"] == "startup") or \
+        (obj["event.module"] in ["redis", "haproxy"] and obj["event.dataset"] == "log") or \
+            (obj["event.module"] == "system" and obj["event.dataset"] in ["auth", "syslog"]):
         delete_key(obj, "@timestamp")