AWS documentdb documentation change

Service: documentdb · 2026-03-31 · Documentation low

File: documentdb/latest/developerguide/in-aggregation.md

Summary

Added new documentation page for the $in aggregation operator in Amazon DocumentDB, including syntax, parameters, MongoDB shell example, and code examples in Node.js and Python with TLS connection details

Security assessment

The change adds standard documentation for a database operator without mentioning any security vulnerabilities or incidents. However, it includes security documentation by showing TLS-enabled connection strings with tls=true and tlsCAFile parameters, which demonstrates secure connection practices for DocumentDB. The code examples explicitly use TLS for encrypted connections, which is a security best practice.

Diff

diff --git a/documentdb/latest/developerguide/in-aggregation.md b/documentdb/latest/developerguide/in-aggregation.md
index 8b1378917..949b6bd1d 100644
--- a//documentdb/latest/developerguide/in-aggregation.md
+++ b//documentdb/latest/developerguide/in-aggregation.md
@@ -0,0 +1 @@
+[](/pdfs/documentdb/latest/developerguide/developerguide.pdf#in-aggregation "Open PDF")
@@ -1,0 +3,127 @@
+[Documentation](/index.html)[Amazon DocumentDB](/documentdb/index.html)[Developer Guide](what-is.html)
+
+Example (MongoDB Shell)Code examples
+
+# $in
+
+The `$in` aggregation operator checks if a specified value exists within an array. It returns `true` if the value is found in the array, and `false` otherwise.
+
+**Parameters**
+
+  * `value`: The value to search for.
+
+  * `array`: The array to search within.
+
+
+
+
+## Example (MongoDB Shell)
+
+The following example demonstrates using the `$in` operator to check if a specific skill exists in each employee's skill set.
+
+**Create sample documents**
+    
+    
+    db.employees.insertMany([
+      { _id: 1, name: "Sarah", skills: ["Python", "JavaScript", "SQL"] },
+      { _id: 2, name: "Mike", skills: ["Java", "C++", "Go"] },
+      { _id: 3, name: "Emma", skills: ["Python", "Ruby", "Rust"] }
+    ]);
+
+**Query example**
+    
+    
+    db.employees.aggregate([
+      {
+        $project: {
+          name: 1,
+          hasPython: { $in: ["Python", "$skills"] }
+        }
+      }
+    ]);
+
+**Output**
+    
+    
+    [
+      { _id: 1, name: 'Sarah', hasPython: true },
+      { _id: 2, name: 'Mike', hasPython: false },
+      { _id: 3, name: 'Emma', hasPython: true }
+    ]
+
+## Code examples
+
+To view a code example for using the `$in` aggregation operator, choose the tab for the language that you want to use:
+
+Node.js
+    
+    
+    
+    const { MongoClient } = require('mongodb');
+    
+    async function example() {
+      const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
+      const db = client.db('test');
+      const collection = db.collection('employees');
+    
+      const result = await collection.aggregate([
+        {
+          $project: {
+            name: 1,
+            hasPython: { $in: ["Python", "$skills"] }
+          }
+        }
+      ]).toArray();
+    
+      console.log(result);
+      await client.close();
+    }
+    
+    example();
+
+Python
+    
+    
+    
+    from pymongo import MongoClient
+    
+    def example():
+        client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
+        db = client['test']
+        collection = db['employees']
+    
+        result = list(collection.aggregate([
+            {
+                '$project': {
+                    'name': 1,
+                    'hasPython': { '$in': ['Python', '$skills'] }
+                }
+            }
+        ]))
+    
+        print(result)
+        client.close()
+    
+    example()
+
+![Warning](https://d1ge0kk1l5kms0.cloudfront.net/images/G/01/webservices/console/warning.png) **Javascript is disabled or is unavailable in your browser.**
+
+To use the Amazon Web Services Documentation, Javascript must be enabled. Please refer to your browser's Help pages for instructions.
+
+[Document Conventions](/general/latest/gr/docconventions.html)
+
+$ifNull
+
+$indexOfArray
+
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+
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+
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+
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+
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+
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