Logstash concatinates topics

Hi! I have pipeline kafka→logstash→Elasticsearch
I created two topics in kafka: test-1 and test-2
Write manually to these topics messages: 67 into test-1 and 67 into test-2.
I wrote two logstash workers

test1.conf

input {
    kafka {
        bootstrap_servers => "172.29.39.115:9093,172.29.39.116:9093"
        topics => "test-1"
        #consumer_threads => 2
        client_id => "logstash-test-1"
        group_id => "logstash-test-1-0"
        security_protocol => "SSL"
        ssl_keystore_location => "/opt/logstash/config/server.keystore.p12"
        ssl_keystore_password => "passwd"
        ssl_truststore_location => "/opt/logstash/config/truststore.jks"
        ssl_truststore_password => "passwd"
        #ssl_endpoint_identification_algorithm => ""
    }
}
output {
    elasticsearch {
        hosts => ["172.29.39.141:9200", "172.29.39.142:9200", "172.29.39.143:9200", "172.29.39.144:9200"]
        ssl => true
        cacert => "/etc/certificates/salt-ca.crt"
        user => logstash_internal
        password => "passwd"
        index => "test-1"
    }
}

test2.conf

input {
    kafka {
        bootstrap_servers => "172.29.39.115:9093,172.29.39.116:9093"
        topics => "test-2"
        #consumer_threads => 2
        client_id => "logstash-test-2"
        group_id => "logstash-test-2-0"
        security_protocol => "SSL"
        ssl_keystore_location => "/opt/logstash/config/server.keystore.p12"
        ssl_keystore_password => "passwd"
        ssl_truststore_location => "/opt/logstash/config/truststore.jks"
        ssl_truststore_password => "passwd"
        #ssl_endpoint_identification_algorithm => ""
    }
}
output {
    elasticsearch {
        hosts => ["172.29.39.141:9200", "172.29.39.142:9200", "172.29.39.143:9200", "172.29.39.144:9200"]
        ssl => true
        cacert => "/etc/certificates/salt-ca.crt"
        user => logstash_internal
        password => "passwd"
        index => "test-2"
    }
}

I thought that I will have two indices in Elasticsearch, test-1 with 67 docs and test-2 with 60 docs, but I have test-1 with 127 docs and test-2 with 127 docs.

What I doing wrong?

See this answer.