Create a Multi-Language Text Index in MongoDB

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When you create a text index in MongoDB, the index uses a default language of english.

The default language determines the rules to parse word roots (i.e. stemming) and ignore stop words.

However, you can change the default language if required.

You can also specify a language at the document level, and even at the subdocument level. The default language will only be used if a language hasn’t been specified at the document or subdocument level.

This article presents examples of specifying a language for a text index.

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Create a Text Index with Different Field Weights in MongoDB

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When you create a text index in MongoDB, you have the option of applying different weights to each indexed field.

These weights denote the relative significance of the indexed fields to each other. A field with a higher weight will have more impact in the search results than a field with a lower weight.

This provides you with a certain amount of control over how the search results are calculated.

The default weight is 1, so if you don’t specify a weight for field, it will be assigned a weight of 1.

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Create a Wildcard Text Index in MongoDB

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MongoDB provides us with the ability to create wildcard text indexes.

Wildcard text indexes are similar to wildcard indexes, except that wildcard text indexes support the $text operator, whereas wildcard indexes don’t.

That said, creating each index type is very similar in the sense that they both share the wildcard $** field pattern.

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MongoDB dropIndexes()

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In MongoDB, the dropIndexes() method allows you to drop one or more indexes from a collection.

To drop a single index, pass the name of the index or its definition/specification document. If it’s a text index, you can only specify the index name.

To drop multiple indexes, pass the index names in an array.

To drop all indexes (except for the _id index), don’t pass any arguments.

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MongoDB dropIndex()

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There are several ways to drop an index in MongoDB, one of which is to use the dropIndex() method.

It’s pretty simple to use – just pass the name of the index or its definition/specification document. If it’s a text index, you can only specify the index name.

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How unhideIndex() Works in MongoDB

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In MongoDB, the db.collection.unhideIndex() method unhides a hidden index.

A hidden index is one that’s hidden from the query planner. When you unhide an index, it is no longer hidden from the query planner, and it’s immediately available for use.

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How hideIndex() Works in MongoDB

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MongoDB introduced the db.collection.hideIndex() method in MongoDB 4.4.

This method hides an existing index from the query planner. This allows you to evaluate the potential impact of dropping an index without actually dropping the index.

If hiding it has a negative impact, you can use db.collection.unhideIndex() to unhide the index. This saves you from having to drop the index, then recreate it.

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