Topic search not working in People API

For the past 1 month, the topic search is not working in the People API.

When a topic is added and the query is provided, an error message is shown below. I have tried it multiple user accounts, multiple topics and as well as with different tenants as well but the issue seems to persist.

Here is the API query provided and the error response:

https://graph.microsoft.com/v1.0/me/people/?$search="topic: microsoft"
{
"error": {
"code": "ErrorInternalServerError",
"message": "An internal server error occurred. The operation failed.",
"innerError": {
"request-id": "21856e34-e8b5-4caa-afa7-d0c596555c59",
"date": "2019-05-05T10:01:55"
}
}
}