I have indexes setup on customer schema like below

CustomerSchema.index({ firstName: 1, dob: 1 });
CustomerSchema.index({ firstName: 1, lastName: 1, dob: 1 });
CustomerSchema.index({
  firstName: 'text',
  lastName: 'text',
  primaryPhone: 'text',
  primaryEmail: 'text',
  masterId: 'text',
  'sourceIds.id': 'text',
});
CustomerSchema.index({ lastName: 1, dob: 1 });
CustomerSchema.index({ 'phones.value': 1, 'phones.type': 1 });

export const Customers = mongoose.model('customers', CustomerSchema);

I have a search functionality in the frontend and this is what we are doing for the search functionality in the backend , we are using node and mongoose

if (searchQuery) {
          q.push({
            $match: {
              $or: [
                { primaryPhone: { $regex: searchQuery, $options: 'i' } },
                { primaryEmail: { $regex: searchQuery, $options: 'i' } },
                { 'sourceIds.id': { $regex: searchQuery, $options: 'i' } },
                { firstName: { $regex: searchQuery, $options: 'i' } },
                { lastName: { $regex: searchQuery, $options: 'i' } },
                { masterId: { $regex: searchQuery, $options: 'i' } },
              ],
            },
          });
        }

Couple of issues with the above code

• It’s using regex so performance is slow
• when the search query is “Karthik surya” it does not match the records where firstName is “Karthik”

so for the reasons mentioned above I decided to use text search and changed the code to below

if (searchQuery) {
          q.push({
            $match: {
              $text: {
                $search: searchQuery,
                $path: [
                  'primaryPhone',
                  'primaryEmail',
                  'sourceIds.id',
                  'firstName',
                  'lastName',
                  'masterId',
                ],
              },
            },
          });
        }

so when the query is executed I am getting the following error

 MongoServerError: extra fields in $text
        at Connection.onMessage (C:guardian-groupc360-customersnode_modulesmongoosenode_modulesmongodbsrccmapconnection.ts:421:18)
        at MessageStream.<anonymous> (C:guardian-groupc360-customersnode_modulesmongoosenode_modulesmongodbsrccmapconnection.ts:251:56)

what am i doing wrong ? and is there a better way to achieve this? should i use a search index provided by atlas?