L2SS-541: delete mariadb entry from elk

docker-compose/elk/logstash/conf.d/23-parse-maria-db.conf

-filter {
-  # mark all our mariadb instances
-  grok {
-    match => {
-      "program" => [ "archiver-maria-db", "tangodb" ]
-    }
-    add_tag => [ "mariadb" ]
-  }
-
-  # parse mariadb output
-  if "mariadb" in [tags] {
-    grok {
-      match => {
-        "message" => [
-          "%{TIMESTAMP_ISO8601:timestamp} .%{WORD:level}. %{GREEDYDATA:message}",
-          "%{TIMESTAMP_ISO8601:timestamp} 0 .%{WORD:level}. %{GREEDYDATA:message}"
-        ]
-      }
-      "overwrite" => [ "timestamp", "level", "message" ]
-    }
-    mutate {
-      gsub => [
-        "level", "Note", "Info"
-      ]
-      uppercase => [ "level" ]
-    }
-    date {
-      match => [ "timestamp", "YYYY-MM-dd HH:mm:ssZZ", "YYYY-MM-dd HH:mm:ss", "YYYY-MM-dd  H:mm:ss"  ]
-      timezone => "UTC"
-    }
-  }
-}