These are the logs when enable_central_logging is enabled:
[sdake@minime-03 kolla]$ docker logs heka
INFO:__main__:Kolla config strategy set to: COPY_ALWAYS
INFO:__main__:Loading config file at /var/lib/kolla/config_files/config.json
INFO:__main__:Validating config file
INFO:__main__:Copying service configuration files
INFO:__main__:Creating dest parent directory: /etc/heka
INFO:__main__:Copying /var/lib/kolla/config_files/heka-elasticsearch.toml to /etc/heka/heka-elasticsearch.toml
INFO:__main__:Setting permissions for /etc/heka/heka-elasticsearch.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-global.toml to /etc/heka/heka-global.toml
INFO:__main__:Setting permissions for /etc/heka/heka-global.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-haproxy.toml to /etc/heka/heka-haproxy.toml
INFO:__main__:Setting permissions for /etc/heka/heka-haproxy.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-rabbitmq.toml to /etc/heka/heka-rabbitmq.toml
INFO:__main__:Setting permissions for /etc/heka/heka-rabbitmq.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-openstack.toml to /etc/heka/heka-openstack.toml
INFO:__main__:Setting permissions for /etc/heka/heka-openstack.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-mariadb.toml to /etc/heka/heka-mariadb.toml
INFO:__main__:Setting permissions for /etc/heka/heka-mariadb.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-keystone.toml to /etc/heka/heka-keystone.toml
INFO:__main__:Setting permissions for /etc/heka/heka-keystone.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-horizon.toml to /etc/heka/heka-horizon.toml
INFO:__main__:Setting permissions for /etc/heka/heka-horizon.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-account-auditor.toml to /etc/heka/heka-swift-account-auditor.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-account-auditor.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-account-reaper.toml to /etc/heka/heka-swift-account-reaper.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-account-reaper.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-account-replicator.toml to /etc/heka/heka-swift-account-replicator.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-account-replicator.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-account-server.toml to /etc/heka/heka-swift-account-server.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-account-server.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-container-auditor.toml to /etc/heka/heka-swift-container-auditor.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-container-auditor.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-container-replicator.toml to /etc/heka/heka-swift-container-replicator.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-container-replicator.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-container-server.toml to /etc/heka/heka-swift-container-server.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-container-server.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-container-updater.toml to /etc/heka/heka-swift-container-updater.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-container-updater.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-object-auditor.toml to /etc/heka/heka-swift-object-auditor.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-object-auditor.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-object-expirer.toml to /etc/heka/heka-swift-object-expirer.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-object-expirer.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-object-replicator.toml to /etc/heka/heka-swift-object-replicator.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-object-replicator.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-object-server.toml to /etc/heka/heka-swift-object-server.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-object-server.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-object-updater.toml to /etc/heka/heka-swift-object-updater.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-object-updater.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-proxy-server.toml to /etc/heka/heka-swift-proxy-server.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-proxy-server.toml
INFO:__main__:Copying /var/lib/kolla/config_files/heka-swift-rsyncd.toml to /etc/heka/heka-swift-rsyncd.toml
INFO:__main__:Setting permissions for /etc/heka/heka-swift-rsyncd.toml
INFO:__main__:Writing out command to execute
Running command: '/usr/bin/hekad -config=/etc/heka/'
2016/03/23 19:50:39 Pre-loading: [elasticsearch_output]
2016/03/23 19:50:39 Pre-loading: [elasticsearch_json_encoder]
2016/03/23 19:50:39 Pre-loading: [multi_log_decoder]
2016/03/23 19:50:39 Pre-loading: [syslog_input]
2016/03/23 19:50:39 Pre-loading: [syslog_encoder]
2016/03/23 19:50:39 Pre-loading: [syslog_log_decoder]
2016/03/23 19:50:39 Pre-loading: [swift_log_decoder]
2016/03/23 19:50:39 Pre-loading: [haproxy_file_output]
2016/03/23 19:50:39 Pre-loading: [keepalived_file_output]
2016/03/23 19:50:39 Pre-loading: [horizon_apache_log_decoder]
2016/03/23 19:50:39 Pre-loading: [horizon_apache_logstreamer_input]
2016/03/23 19:50:39 Pre-loading: [keystone_apache_log_decoder]
2016/03/23 19:50:39 Pre-loading: [keystone_apache_logstreamer_input]
2016/03/23 19:50:39 Pre-loading: [mariadb_log_decoder]
2016/03/23 19:50:39 Pre-loading: [mariadb_logstreamer_input]
2016/03/23 19:50:39 Pre-loading: [openstack_log_decoder]
2016/03/23 19:50:39 Pre-loading: [openstack_logstreamer_input]
2016/03/23 19:50:39 Pre-loading: [rabbitmq_log_decoder]
2016/03/23 19:50:39 Pre-loading: [rabbitmq_log_splitter]
2016/03/23 19:50:39 Pre-loading: [rabbitmq_logstreamer_input]
2016/03/23 19:50:39 Pre-loading: [swift-account-auditor_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-account-reaper_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-account-replicator_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-account-server_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-container-auditor_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-container-replicator_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-container-server_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-container-updater_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-object-auditor_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-object-expirer_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-object-replicator_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-object-server_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-object-updater_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-proxy-server_file_output]
2016/03/23 19:50:39 Pre-loading: [swift-rsyncd_file_output]
2016/03/23 19:50:39 Pre-loading: [ProtobufDecoder]
2016/03/23 19:50:39 Loading: [ProtobufDecoder]
2016/03/23 19:50:39 Pre-loading: [ProtobufEncoder]
2016/03/23 19:50:39 Loading: [ProtobufEncoder]
2016/03/23 19:50:39 Pre-loading: [TokenSplitter]
2016/03/23 19:50:39 Loading: [TokenSplitter]
2016/03/23 19:50:39 Pre-loading: [HekaFramingSplitter]
2016/03/23 19:50:39 Loading: [HekaFramingSplitter]
2016/03/23 19:50:39 Pre-loading: [NullSplitter]
2016/03/23 19:50:39 Loading: [NullSplitter]
2016/03/23 19:50:39 Loading: [syslog_log_decoder]
2016/03/23 19:50:39 Loading: [swift_log_decoder]
2016/03/23 19:50:39 Loading: [horizon_apache_log_decoder]
2016/03/23 19:50:39 Loading: [keystone_apache_log_decoder]
2016/03/23 19:50:39 Loading: [mariadb_log_decoder]
2016/03/23 19:50:39 Loading: [openstack_log_decoder]
2016/03/23 19:50:39 Loading: [rabbitmq_log_decoder]
2016/03/23 19:50:39 Loading: [multi_log_decoder]
2016/03/23 19:50:39 Loading: [elasticsearch_json_encoder]
2016/03/23 19:50:39 Loading: [syslog_encoder]
2016/03/23 19:50:39 Loading: [rabbitmq_log_splitter]
2016/03/23 19:50:39 Loading: [syslog_input]
2016/03/23 19:50:39 Loading: [horizon_apache_logstreamer_input]
2016/03/23 19:50:39 Loading: [keystone_apache_logstreamer_input]
2016/03/23 19:50:39 Loading: [mariadb_logstreamer_input]
2016/03/23 19:50:39 Loading: [openstack_logstreamer_input]
2016/03/23 19:50:39 Loading: [rabbitmq_logstreamer_input]
2016/03/23 19:50:39 Loading: [elasticsearch_output]
2016/03/23 19:50:39 Loading: [haproxy_file_output]
2016/03/23 19:50:39 Loading: [keepalived_file_output]
2016/03/23 19:50:39 Loading: [swift-account-auditor_file_output]
2016/03/23 19:50:39 Loading: [swift-account-reaper_file_output]
2016/03/23 19:50:39 Loading: [swift-account-replicator_file_output]
2016/03/23 19:50:39 Loading: [swift-account-server_file_output]
2016/03/23 19:50:39 Loading: [swift-container-auditor_file_output]
2016/03/23 19:50:39 Loading: [swift-container-replicator_file_output]
2016/03/23 19:50:39 Loading: [swift-container-server_file_output]
2016/03/23 19:50:39 Loading: [swift-container-updater_file_output]
2016/03/23 19:50:39 Loading: [swift-object-auditor_file_output]
2016/03/23 19:50:39 Loading: [swift-object-expirer_file_output]
2016/03/23 19:50:39 Loading: [swift-object-replicator_file_output]
2016/03/23 19:50:39 Loading: [swift-object-server_file_output]
2016/03/23 19:50:39 Loading: [swift-object-updater_file_output]
2016/03/23 19:50:39 Loading: [swift-proxy-server_file_output]
2016/03/23 19:50:39 Loading: [swift-rsyncd_file_output]
2016/03/23 19:50:39 Starting hekad...
2016/03/23 19:50:39 Output started: swift-object-replicator_file_output
2016/03/23 19:50:39 Output started: swift-object-server_file_output
2016/03/23 19:50:39 Output started: swift-proxy-server_file_output
2016/03/23 19:50:39 Output started: swift-rsyncd_file_output
2016/03/23 19:50:39 Output started: swift-object-updater_file_output
2016/03/23 19:50:39 Output started: elasticsearch_output
2016/03/23 19:50:39 Output started: keepalived_file_output
2016/03/23 19:50:39 Output started: swift-container-auditor_file_output
2016/03/23 19:50:39 Output started: swift-container-server_file_output
2016/03/23 19:50:39 Output started: swift-object-expirer_file_output
2016/03/23 19:50:39 Output started: haproxy_file_output
2016/03/23 19:50:39 Output started: swift-account-replicator_file_output
2016/03/23 19:50:39 Output started: swift-container-replicator_file_output
2016/03/23 19:50:39 Output started: swift-object-auditor_file_output
2016/03/23 19:50:39 Output started: swift-account-auditor_file_output
2016/03/23 19:50:39 Output started: swift-account-reaper_file_output
2016/03/23 19:50:39 Output started: swift-account-server_file_output
2016/03/23 19:50:39 Output started: swift-container-updater_file_output
2016/03/23 19:50:39 MessageRouter started.
2016/03/23 19:50:39 Input started: openstack_logstreamer_input
2016/03/23 19:50:39 Input started: rabbitmq_logstreamer_input
2016/03/23 19:50:39 Input started: syslog_input
2016/03/23 19:50:39 Input started: horizon_apache_logstreamer_input
2016/03/23 19:50:39 Input started: keystone_apache_logstreamer_input
2016/03/23 19:50:39 Input started: mariadb_logstreamer_input
2016/03/23 19:50:57 Plugin 'elasticsearch_output' error: can't index: HTTP request failed: Post http://192.168.1.148:9200/_bulk: dial tcp 192.168.1.148:9200: no route to host
2016/03/23 19:51:00 Plugin 'elasticsearch_output' error: can't index: HTTP request failed: Post http://192.168.1.148:9200/_bulk: dial tcp 192.168.1.148:9200: no route to host
2016/03/23 19:51:01 Plugin 'elasticsearch_output' error: can't index: HTTP response didn't contain valid JSON. Status: 503 Service Unavailable. Body: 503 Service Unavailable
No server is available to handle this request.
2016/03/23 19:51:04 Plugin 'elasticsearch_output' error: can't index: HTTP response didn't contain valid JSON. Status: 503 Service Unavailable. Body: 503 Service Unavailable
No server is available to handle this request.
2016/03/23 19:51:08 Plugin 'elasticsearch_output' error: can't index: HTTP response didn't contain valid JSON. Status: 503 Service Unavailable. Body: 503 Service Unavailable
No server is available to handle this request.
2016/03/23 19:51:13 Plugin 'elasticsearch_output' error: can't index: HTTP response didn't contain valid JSON. Status: 503 Service Unavailable. Body: 503 Service Unavailable
No server is available to handle this request.
2016/03/23 19:51:18 Plugin 'elasticsearch_output' error: can't index: HTTP response didn't contain valid JSON. Status: 503 Service Unavailable. Body: 503 Service Unavailable
No server is available to handle this request.