Question

When creating a text index on multiple fields, you can specify the individual fields or you can use wildcard specifier ______

(a) ($*)

(b) (**$**)

(c) ($**)

(d) None of the mentioned

This question was addressed to me in unit test.

This interesting question is from Text Search in division Index/Indexing Concepts of MongoDB

Answer 1

The correct answer is (c) ($**)

The best I can explain: You can create a text index on the field or fields whose value is a string or an array of string elements.