[BUG] Datasource GET api does not work as expected if name has capital character

[penghuo]

What is the bug?

POST {{baseUrl}}/_plugins/_query/_datasources
Content-Type: application/x-ndjson

{
  "name": "myS3",
  "description": "",
  "connector": "S3GLUE",
  "allowedRoles": [],
  "properties": {
  }
}

GET {{baseUrl}}/_plugins/_query/_datasources/myS3

{
  "status": 404,
  "error": {
    "type": "DataSourceNotFoundException",
    "reason": "There was internal problem at backend",
    "details": "DataSource with name myS3 doesn\u0027t exist."
  }
}

What is the expected behavior?

GET {{baseUrl}}/_plugins/_query/_datasources/myS3

return datasource

{
  "name": "myS3",
  "description": "",
  "connector": "S3GLUE",
  "allowedRoles": [],
  "properties": {
  }
}

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