[Enhancement] Verify the chunk size of the snapshot when restoring a searchable snapshot

[bugmakerrrrrr]

Is your feature request related to a problem? Please describe

During snapshotting in OpenSearch, large files are divided into fixed-size chunks. When restoring a snapshot as a searchable snapshot, the files are retrieved in fixed-size blocks as required. However, if the chunk size is not a multiple of the block size, it can cause issues where blocks span across two or more chunks, resulting in only the first part being fetched. This can lead to an EOF exception being thrown during searching.

Describe the solution you'd like

Verify that the chunk size of a snapshot used in the construction of RemoteSnapshotDirectory is a multiple of the block size. If it is not, an IllegalArgumentException will be thrown.

Related component

Other

Describe alternatives you've considered

No response

Additional context

No response

[bugmakerrrrrr]

Closing in favour of #9676