[[Back up your data.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/modules-snapshots.html
[[Reindex your Elasticsearch 1.x indices.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/reindex-upgrade.html
[[Upgrade Elasticsearch for Hadoop to 5.6.|https://www.elastic.co/guide/en/elasticsearch/hadoop/5.6/install.html
[[Upgrade Elasticsearch to 5.6.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/restart-upgrade.html
[[Install Elasticsearch 5.6.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/_installation.html
[[Install X-Pack.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/installing-xpack-es.html
[[Back up your data.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/modules-snapshots.html
[[Stop any running Machine Learning jobs.|https://www.elastic.co/guide/en/x-pack/current/stopping-ml.html
[[Upgrade one node at a time to Elasticsearch 5.6.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/rolling-upgrades.html
[[Stop any running Machine Learning jobs.|https://www.elastic.co/guide/en/x-pack/current/stopping-ml.html
[[Shut down your cluster and install Elasticsearch 6.3 on all nodes.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/restart-upgrade.html
[[Upgrade Kibana to 5.6.|https://www.elastic.co/guide/en/kibana/5.6/upgrade.html
[[Install X-Pack into Kibana.|https://www.elastic.co/guide/en/kibana/5.6/installing-xpack-kb.html
[[Upgrade Logstash to 5.6.|https://www.elastic.co/guide/en/logstash/5.6/upgrading-logstash.html
[[Install X-Pack into Logstash.|https://www.elastic.co/guide/en/logstash/5.6/installing-xpack-log.html
[[Upgrade each beat to 5.6 and restart them.|https://www.elastic.co/guide/en/beats/libbeat/6.3/upgrading-5-to-6.html#upgrading-to-5.6
[[Upgrade Elasticsearch for Hadoop to 5.6.|https://www.elastic.co/guide/en/elasticsearch/hadoop/5.6/install.html
[[Stop any running Machine Learning jobs.|https://www.elastic.co/guide/en/elastic-stack-overview/6.3/stopping-ml.html
[[Upgrade Elasticsearch for Hadoop to 6.3.|https://www.elastic.co/guide/en/elasticsearch/hadoop/6.3/install.html
[[Upgrade Elasticsearch to 6.3.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/rolling-upgrades.html
[[Back up your data.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/modules-snapshots.html
[[If you're using the default changeme password, change your password.|https://www.elastic.co/guide/en/x-pack/5.6/setting-up-authentication.html#reset-built-in-user-passwords
[[Install X-Pack into Elasticsearch and Kibana.|https://www.elastic.co/guide/en/x-pack/5.6/installing-xpack.html
[[Use the Upgrade Assistant to:|https://www.elastic.co/guide/en/kibana/5.6/xpack-upgrade-assistant.html
[[Check the Elasticsearch deprecation log.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/settings.html#deprecation-logging
[[Reindex your 2.x indices.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/reindex-upgrade.html
[[Upgrade the internal Kibana index.|https://www.elastic.co/guide/en/kibana/6.3/migrating-6.0-index.html
[[Create a temporary super user and upgrade the internal .security index.|https://www.elastic.co/guide/en/elastic-stack/6.3/upgrading-elastic-stack.html#upgrade-internal-indices
[[Delete the temporary super user.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/users-command.html
[[Upgrade the internal .kibana index.|https://www.elastic.co/guide/en/elastic-stack/6.3/upgrading-elastic-stack.html#upgrade-internal-indices
[[Upgrade Kibana to 6.3.|https://www.elastic.co/guide/en/kibana/6.3/upgrade.html
[[Use the Kibana Upgrade assistant to upgrade the internal X-Pack indices.|https://www.elastic.co/guide/en/kibana/6.3/xpack-upgrade-assistant.html#reindex-helper
[[Upgrade Logstash to 6.3.|https://www.elastic.co/guide/en/logstash/5.6/upgrading-logstash.html
[[Install X-Pack into Logstash.|https://www.elastic.co/guide/en/logstash/5.6/installing-xpack-log.html
[[Upgrade each beat to 6.3 and restart them.|https://www.elastic.co/guide/en/beats/libbeat/6.3/upgrading-5-to-6.html#upgrading-to-5.6
[[Upgrade Elasticsearch for Hadoop to 6.3.|https://www.elastic.co/guide/en/elasticsearch/hadoop/6.3/install.html
[[Reindex any 1.x indices that you need to carry forward.|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/reindex-upgrade.html
[[Upgrade your cluster to 5.6.|https://www.elastic.co/guide/en/cloud/current/ec-upgrading-v5.html
[[Upgrade your cluster to 5.6.|https://www.elastic.co/guide/en/cloud/current/ec-upgrading-v5.html
[[Reindex any 2.x indices that you need to carry forward.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/reindex-upgrade.html
[[Perform a full cluster restart upgrade to 6.3.|https://www.elastic.co/guide/en/cloud/saas-release/ec-upgrading-v6.html
[[Elasticsearch breaking changes|https://www.elastic.co/guide/en/elasticsearch/reference/5.6/breaking-changes.html
[[Beats breaking changes|https://www.elastic.co/guide/en/beats/libbeat/5.6/breaking-changes.html
[[Logstash breaking changes|https://www.elastic.co/guide/en/logstash/5.6/breaking-changes.html
[[Kibana breaking changes|https://www.elastic.co/guide/en/kibana/5.6/breaking-changes.html
[[Elasticsearch breaking changes|https://www.elastic.co/guide/en/elasticsearch/reference/6.0/breaking-changes.html
[[Beats breaking changes|https://www.elastic.co/guide/en/beats/libbeat/6.0/breaking-changes-6.0.html
[[Logstash breaking changes|https://www.elastic.co/guide/en/logstash/6.0/breaking-changes.html
[[Kibana breaking changes|https://www.elastic.co/guide/en/kibana/6.0/breaking-changes-6.0.html
[[Enable Transport Layer Security (TLS) to secure cluster communications.|https://www.elastic.co/guide/en/x-pack/current/ssl-tls.html
[[Upgrade Kibana to 6.3.|https://www.elastic.co/guide/en/kibana/6.3/upgrade.html
[[Upgrade Logstash to 6.3.|https://www.elastic.co/guide/en/logstash/6.3/upgrading-logstash.html
[[Upgrade each beat to 6.3 and restart them.|https://www.elastic.co/guide/en/beats/libbeat/6.3/upgrading-minor-versions.html
[[Upgrade Elasticsearch for Hadoop to 6.3.|https://www.elastic.co/guide/en/elasticsearch/hadoop/6.3/install.html
[[Back up your data.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/modules-snapshots.html
[[Check the Elasticsearch deprecation log.|https://www.elastic.co/guide/en/elasticsearch/reference/6.3/settings.html#deprecation-logging