syslog-ng plugin de destination elasticsearch2 non trouvé

J'ai Linux Mint 19. syslog-ng --version:

options {
    threaded(yes);
    use-uniqid(yes);
};

source s_syslog {
    syslog();
};

destination d_elastic {
    elasticsearch2(
        index("syslog-ng")
        type("test")
        cluster("mycluster1")
        client-mode("transport")
        custom-id("${UNIQID}")
        flush-limit("10000")
    );
};

log {
    source(s_syslog);
    destination(d_elastic);
    flags(flow-control);
};

syslog-ng config pour le fichier de recherche élastique:

options {
                threaded(yes);
                use-uniqid(yes);
            };

            source s_syslog {
                syslog();
            };

            destination d_elastic {
                elasticsearch2(
                    index("syslog-ng")
                    type("test")
                    cluster("mycluster1")
                    client-mode("transport")
                    custom-id("${UNIQID}")
                    flush-limit("10000")
                );
            };

            log {
                source(s_syslog);
                destination(d_elastic);
                flags(flow-control);
            };

Lorsque j'essaie de redémarrer le service syslog-ng de sudo, j'ai les informations d'erreur suivantes:

Jan 11 11:14:44  syslog-ng[19156]: Error parsing destination statement, destination plugin elasticsearch2 not found in /etc/syslog-ng/conf.d/elastic.conf:
Jan 11 11:14:44  syslog-ng[19156]: 6       source s_syslog {
Jan 11 11:14:44  syslog-ng[19156]: 7           syslog();
Jan 11 11:14:44  syslog-ng[19156]: 8       };
Jan 11 11:14:44  syslog-ng[19156]: 9
Jan 11 11:14:44  syslog-ng[19156]: 10      destination d_elastic {
Jan 11 11:14:44  syslog-ng[19156]: 11---->     elasticsearch2(
Jan 11 11:14:44  syslog-ng[19156]: 11---->     ^^^^^^^^^^^^^^
Jan 11 11:14:44  syslog-ng[19156]: 12          index("syslog-ng")

J'ai installé mod-java pour syslog-ng et jdk, jre, etc. Qu'est-ce que je fais mal? Merci!