[BWC] OpenSearch Dashboards 2.x compatabile with 7.10.x

[kavilla]

Is your feature request related to a problem? Please describe.

With no longer targeting: #1099 for OpenSearch Dashboards 2.0.0, then we still try to make OpenSearch Dashboards compatible with the legacy search engine similar to what OpenSearch did in this PR: opensearch-project/OpenSearch#1902

Describe the solution you'd like

OpenSearch Dashboards can start up and run without error against a legacy search engine of 7.10.

Here:

• https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/src/core/server/opensearch/version_check/opensearch_opensearch_dashboards_version_compatability.ts#L107
• https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/src/core/server/ui_settings/create_or_upgrade_saved_config/is_config_version_upgradeable.ts#L78

Describe alternatives you've considered

n/a

Additional context

Not sure if the intention of the OpenSearch change was to make it possible to migrate from the legacy 7.10.x to OpenSearch 2.x directly (skipping over OpenSearch 1.x)

[kavilla]

@nknize, @dblock,

Is the plan on making it possible for people to migrate directly from a legacy version (for example 7.10.2) directly to OpenSearch 2.x?

Also, the PR I linked for OpenSearch makes it seem you can have a cluster that 7.10.x but right now it is only possible for OpenSearch Dashboards to connect to 7.10.2. Should this be updated on OpenSearch Dashboards side?

[dblock]

@nknize, @dblock,

Is the plan on making it possible for people to migrate directly from a legacy version (for example 7.10.2) directly to OpenSearch 2.x?

There will be a migration path, but I don't have a definitive answer re:directly. I certainly wouldn't do anything to prevent it.

Also, the PR I linked for OpenSearch makes it seem you can have a cluster that 7.10.x but right now it is only possible for OpenSearch Dashboards to connect to 7.10.2. Should this be updated on OpenSearch Dashboards side?

Yes, likely.

[kavilla]

I certainly wouldn't do anything to prevent it.

Understood there might be some limitation once we start getting in the higher numbers but that's most likely after 5.x