$text - $search aggregation after lookup mongoDB

Question

I need to search by a keyword into the documents of my DB and I have found this on mongo's official site documentation. However, I have few problems:

1. I need to make a lookup first, and mongo wants the $text search as the first pipeline, so If I make after that the lookup then I exclude the fields from the lookup.

2. I need to search only between some fixed fields and not everywhere.

For example my documents looks like this:

{
  _id: ObjectId('60dcb67ebe94846b27402dc7'),
  field1: "dada",
  field2: "lalala",
  field3: "nanana",
  creator: ObjectId('632cb67ebe94846b27402dc1')
}

I Need to search in field1 , field2 and some fields from creator , let's say creator.name , which I'll have got after doing the lookup. According to the documentation first thing first I have to create an index so let's do it on field1 . After that I have to put the $text aggregation in a $match pipeline, but as its first one.

Do you think it is possible to do first the lookup and after that the $text search? Also is it possible to specify the fields to search in?

Answer 1

To perform text search queries, you must have a text index on your collection. A collection can only have one text search index, but that index can cover multiple fields. You cannot create test index spanning multiple collections.

Also, The $match stage that includes a $text must be the first stage in the pipeline.