[CX] Double quotes not working in this statement: "statement=select * from Metadata.`Index`;"

Following curl command is giving error:

curl -s --data pretty=true --data format=CLEAN_JSON --data-urlencode "statement=select * from Metadata.`Index`;" http://localhost:8095/analytics/service
-bash: Index: command not found
{
"requestID": "293efb9f-08ca-4955-af0f-06d27326a7e1",
"signature": "*",
"errors": [

{ "code": "1", "msg": "org.apache.asterix.common.exceptions.AsterixException: Encountered \" \";\" \"; \"\" at line 1, column 24.\nWas expecting one of:\n <QUOTED_STRING> ...\n <IDENTIFIER> ...\n <IDENTIFIER> ...\n <QUOTED_STRING> ...\n <QUOTED_STRING> ...\n <QUOTED_STRING> ...\n " }

],
"status": "fatal",
"metrics":

{ "elapsedTime": "1.897064ms", "executionTime": "4639704.312252523s", "resultCount": "0", "resultSize": "0" }

}

But single quotes work well:
curl -s --data pretty=true --data format=CLEAN_JSON --data-urlencode 'statement=select * from Metadata.`Index`;' http://localhost:8095/analytics/service