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There are several main methods for migrating data in an ES cluster.

1. Using snapshots and restores: you can perform data migration using the snapshot and restore feature provided by Elasticsearch. First, create a snapshot of the source cluster, then migrate the snapshot to the target cluster, and finally restore that snapshot on the target cluster.
2. One way to migrate data from the source cluster to the target cluster is by using the reindex API in Elasticsearch. This method requires writing some code to accomplish the data migration.
3. Using data export and import: ES’s export and import tools can be used to export data from the source cluster in JSON format, and then import the JSON data into the target cluster. This method is suitable for migrating small amounts of data.
4. You can also use third-party tools like Logstash and Kibana for migrating data in Elasticsearch clusters, which offer more flexible and advanced migration capabilities.

It is necessary to choose the appropriate method for migrating data in an ES cluster based on specific needs and circumstances.