TestPlansAndSuitesMigrationConfig , How can I skip something that already exists?

[AviramDahan]

I need to rerun the migration test plan due to 503 errors encountered during the migration.
I want to resume it from the point where it stopped.

Microsoft.TeamFoundation.TeamFoundationServiceUnavailableException: HTTP code 503: Service Unavailable ---> System.Net.WebException: The remote server returned an error: (503) Server Unavailable.

`
{

  "$type": "TestPlansAndSuitesMigrationConfig",

  "Enabled": true,

  "PrefixProjectToNodes": true,

  "OnlyElementsWithTag": null,

  "TestPlanQueryBit": null,

  "RemoveAllLinks": false,

  "MigrationDelay": 0,

  "UseCommonNodeStructureEnricherConfig": false,

  "NodeBasePaths": [],

  "AreaMaps": null,

  "IterationMaps": null,

  "RemoveInvalidTestSuiteLinks": false,

  "FilterCompleted": false

}
`

[AviramDahan]

Solution: Server lost connection after some hours. need good connection