redis: Store name-value pairs in Redis

   redis(
        host("<redis-server-address>")
        port("<redis-server-port>")
        auth("<redis-server-password>") # Optional, for password-protected servers
        command("<redis-command>", "<first-command-parameter>", "<second-command-parameter>", "<third-command-parameter>")
    );

   destination d_redis {
        redis(
            host("localhost")
            port(6379)
            command("HINCRBY", "hosts", "$HOST", "1")
        );
    };

   @version: 4.9.0
    
    source s_apache {
        file("/var/log/apache2/access.log");
    };
    
    parser p_apache {
        csv-parser(columns("APACHE.CLIENT_IP", "APACHE.IDENT_NAME", "APACHE.USER_NAME",
                        "APACHE.TIMESTAMP", "APACHE.REQUEST_URL", "APACHE.REQUEST_STATUS",
                        "APACHE.CONTENT_LENGTH", "APACHE.REFERER", "APACHE.USER_AGENT",
                        "APACHE.PROCESS_TIME", "APACHE.SERVER_NAME")
                    flags(escape-double-char,strip-whitespace)
        delimiters(" ")
        quote-pairs('""[]')
        );
    };
    
    destination d_redis {
        redis( command("HINCRBY" "${MONTH_ABBREV} ${DAY} ${HOUR}:${MIN}"  "${APACHE.USER_AGENT}" "1"));
    };
    
    log {
        source(s_apache);
        parser(p_apache);
        destination(d_redis);
    };