Migration Tablet
Request
GET /api/tablet_migration?goal={enum}&tablet_id={int}&schema_hash={int}&disk={string}
Description
Migrate a tablet to the specified disk.
Query parameters
- 
goalrun:submit the migration taskstatus:show the status of migration task
 - 
tablet_idID of the tablet - 
schema_hashSchema hash - 
diskThe specified disk. 
Request body
None
Response
Submit Task
    {
        status: "Success",
        msg: "migration task is successfully submitted."
    }
Or
    {
        status: "Fail",
        msg: "Migration task submission failed"
    }
Show Status
    {
        status: "Success",
        msg: "migration task is running",
        dest_disk: "xxxxxx"
    }
Or
    {
        status: "Success",
        msg: "migration task has finished successfully",
        dest_disk: "xxxxxx"
    }
Or
    {
        status: "Success",
        msg: "migration task failed.",
        dest_disk: "xxxxxx"
    }
Examples
```
curl "http://127.0.0.1:8040/api/tablet_migration?goal=run&tablet_id=123&schema_hash=333&disk=/disk1"
```