SELECT
    author,
    message
FROM
(
    SELECT
        date,
        pos,
        author,
        message,
        ts_headline('russian', message, q, 'HighlightAll = true, StartSel = "", StopSel = ""') AS body
    FROM
        logs,
        plainto_tsquery('russian', $1) AS q
    WHERE
        to_tsvector('russian', message) @@ q
        AND NOT author = ANY ($2)
    ORDER BY
        ts_rank(to_tsvector('russian', message), q)
        DESC
    LIMIT 2000
) AS sq
GROUP BY
    author
ORDER BY
    count(message)
LIMIT 5