QueryAysnc method Query optional

Hi Team,

we have an endpoint 

var items = await client.SearchManager.QueryAsync(query:"", createdAfter: StartDate, createdBefore: EndDate, updatedAfter: StartDate, updatedBefore: EndDate);

some time we don't have need queries to send, in that case how do we make Query optional.

we have another endpoint

var items = await client.SearchManager.SearchAsync(Keyword:"", createdAfter: StartDate, createdBefore: EndDate, updatedAfter: StartDate, updatedBefore: EndDate);

Here we can make keyword optional, but this method was deprecated, it is throwing the exception when i am using.

Could you please provide some solution on this

Thanks

Sai Vamsi