Exclude "ContentLink Id" of variant or product type from search

Currently when user search with number and if that matches with "ContentLink Id" of catalog variant/product then that variant/product get returned as a search result. How can I avoid that "ContentLink Id" is being searched from my query?

Below is my sample query used to get products - 

query
.For(searchText)
.WithAndAsDefaultOperator()
.UsingSynonyms()

Note - Find version I am using : 13.2.6.0

Thanks in advance.