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  1. Allow multiple text indexes per collection

    MongoDb only allow one text index by collection, in contrast of other index types.

    This is a limitation that makes it difficult to develop projects with search functionality, for example, if you want to add a text search for advanced users on all fields and a public search on a subset of fields, there isn't a simple and performant way to solve it.

    Many developers end up using other products like elastic search, or creating additional collections and using lookup, or using preg_reg or building smart indexes when the creation of multiple text indexes per collection would allow a quick,…

    3 votes

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  2. Automatic Indexes

    MongoDB can already suggest useful indexes. Why not take the next step and allow MongoDB to autonomously create and manage indexes. Ideally it will automatically maintain the indexes over time as the structure and usage of the database changes.

    3 votes

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  3. Rename an existing index

    Allow for the possibility of renaming an existing index, without having to drop and recreate it.

    Let us say a unique index exists in production, it might not be possible to safely drop it. Yet the index name might not be ideal.

    2 votes

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  4. Add expression indexes

    An expression index is one where the value being indexed is the result of an expression, like lower casing a string.

    http://en.wikipedia.org/wiki/Expression_index
    http://www.postgresql.org/docs/8.1/static/indexes-expressional.html

    2 votes

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  5. Make it clear an index not on present on all shards

    We recently had an issue where an index did not get created on all shards. When we ran getIndexes() on mongos it reported the index was present. So we dropped another redundant index thinking all would be well - it was not. We had serious performance issues on the shard that was missing the new index and our app was unavailable for a few hours whilst we re-created the missing index on a huge collection.

    It would be better if getIndexes called on mongos reported some sort of warning or indication that it was not present on all shards. The…

    1 vote

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  6. Please report mixed-type numeric _id fields in $merge stage error

    Posting this idea at the request of one of the Jira users. You can find more technical details about this in the Jira issue:

    https://jira.mongodb.org/browse/SERVER-61613

    The gist of it is that I may have two collections, b2 and b3, that are not distinguishable in the Mongo Shell, like this:

    db.b2.find()
    
    [
    
      { _id: 1, created: ISODate("2021-11-18T23:16:33.149Z") },
    
      { _id: 2, created: ISODate("2021-11-18T23:16:33.149Z") }
    
    ] 
    
    db.b3.find()
    
    [
    
      { _id: 1, created: ISODate("2021-11-18T22:53:02.113Z") },
    
      { _id: 2, created: ISODate("2021-11-18T22:53:02.113Z") }
    
    ] ```
    
    When I merge each into a collection `pg` with this syntax:
    
    

    db.pg.aggregate([{$merge: {into: "b3", whenMatched: "merge", whenNotMatched: "fail"}} ]);…

    1 vote

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