How can I search on multi columns?
Is that like this:

    var response = client.Search<Servers>(s => s
      .Query(q => q
          .QueryString(qs => qs
              .Query("servername:\"server1-9\+OR+description:\"server1-9\"")
          )
      )
  );
it seems somthing wrrong in my command, because it has no any results

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