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Text Index In Mongodb

In this article, we will discuss the text index in MongoDB.

Purpose

The text index supports text search queries on string content.

Syntax

db.collection.createIndex({ fieldName: "text" });

Example

Consider the following collection: -

Picture showing the sample document collection

To create the text index on the name field, we will use the following query: -

db.mycollection.createIndex({"name":"text"})

Picture showing creating the text index in mongodb

Performing Text Search

To perform the text search, we will use the following syntax: -

db.collection.find({ $text: { $search: "searchString" } })

Picture showing searching the text on the column with text index

$Meta Operator

The $meta operator is used in conjunction with text indexes to return additional information about the text search results.

The syntax of the $meta operator is: -

db.collection.find(
   { $text: { $search: "your_search_query" } },
   { score: { $meta: "textScore" } }
)

Picture showing using the $Meta operator in mongodb

The above query provides the metadata textScore. The text score is a numeric value representing the relevance of a document to a given text search query.

Posted By -	Karan Gupta

Posted On -	Friday, May 10, 2024

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