Search partial text via API

I would like to search partial text from all the content's Text and Rich text field using API.
I am not going to use GraphQL as we are Focusing on Native Mobile
We are able to search full text using following query
It return all the documents which have Family word. But I want to achieve same thing when user just types fam. Is there any query that I can pass in API which will return me all the documents which has searched key(Partial key like Fam)

Hello @nelson-thomas.pereir

Thanks for reaching out to us.

We have already discussed this topic here:

Let me know if you have any further questions.