Is it possible to use Data Prepper to migrate from Elasticsearch 7.10.2 to OpenSearch 3.1.0?

[s1191994586-max]

I want to migrate from Elasticsearch 7.10.2 to OpenSearch 3.1.0, but the official documentation says it requires downtime or an in-place upgrade. Is there a solution for smoothly migrating two clusters and then switching the access address?
References：
1.https://opensearch.org/blog/announcing-data-prepper-2-5-0/
2.https://docs.opensearch.org/docs/latest/install-and-configure/upgrade-opensearch/index/#compatibility 
3.https://docs.opensearch.org/2.8/upgrade-to/upgrade-to/

[dlvenable]

@s1191994586-max ,

Data Prepper supports reading data from OpenSearch and Elasticsearch (up to 8) clusters using the opensearch source. It doesn't necessary support live migrations however because it will stop reading any given index when it completes that index at a point in time. @graytaylor0 may be able to give more context.

Have you looked at the https://github.com/opensearch-project/opensearch-migrations project?

[graytaylor0]

@s1191994586-max As @dlvenable mentioned, the opensearch source of data prepper supports doing point in time exports from elasticsearch to opensearch (https://docs.opensearch.org/latest/data-prepper/pipelines/configuration/sources/opensearch/). It is only able to complete point in time upgrades, which means that changes that are written to the source cluster after the data prepper is started will not be propagated. The source does support completing periodic point in time snapshots of the indexes, but it is somewhwat expensive since the entire index will be processed again as a snapshot.

This solution https://github.com/opensearch-project/opensearch-migrations may be closer to what you're looking for since it is a full migration solution, not just a data migration solution like Data Prepper is.