Snapshot Migration from ES Native cluster to Opensearch is failing

[Prashant01aug]

Describe the bug

Issue: From 7.12 and above, ES has introduced UUIDs as identifiers for repositories instead on names to better there solutions like ILM, SLM etc this has also introduced things like writer uuid's on shard which is breaking the compatibility with OpenSearch which is a fork on ES 7.10. This is clearly called out on many blogs where data from ES 7.12 and above can not be migrated to OpenSearch at this point in time. Also Elasticsearch themselves doesn't support the data migration on lower versions on the cluster which in our case is also true, i.e from 7.16 to 7.10.

Explorations: The below explorations were tried on ES 7.10 and OpenSearch 1.0/1.1

We tried unpacking the snapshots and explored on the options to enable the backward compatibility and was successful in syncing the snapshots, viewing the list of snapshots available and restoring the snapshots but failed in shard allocation.

To Reproduce
Steps to reproduce the behavior:

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2. Run '....'
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4. See error

Expected behavior
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Configuration (please complete the following information):

• ODFE/Kibana version [e.g. 1.7.0, 1.8.0]
• Distribution [e.g. RPM, DEB, TAR, etc]
• Host Machine [e.g: Centos7, MacOS]

Relevant information
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