MIgrate ElasticSearch 5.x to OpenSearch 1.0

Question

My question is an architectural issue.

I have to migrate one cluster of ElasticSearch version 5.6 to OpenSearch 1.0. There are several methods to migrate this, but, I have to find a better method for my production environment.

Some points to consider:

• My indices were created in 5.6 version, therefore, I have to update them.

Some options that were considered to migration:

• Create a Elastic cluster in version 7.10, migrate my indices to this cluster using "Reindex from a remote cluster" (https://www.elastic.co/guide/en/elasticsearch/reference/7.10/reindex-upgrade-remote.html), with this, I would have my indicies updated, and after this, I would migrate to OpenSearch using backup/restore.
• I can to update my cluster 5.6 to version 6.x and run a "Reindex API" (https://www.elastic.co/guide/en/elasticsearch/reference/6.8/reindex-upgrade.html), and after this, would migrate to OpenSearch 1.0.

Is there any method to migrate indicies in version 5.x to OpenSearch 1.0 directly realizing a reindex? If not, whats the better method I can consider to migrate this?