# How to Reindex in Amazon OpenSearch Serverless Using Amazon OpenSearch Ingestion | AWS Guide
Amazon OpenSearch Service, formerly known as Amazon Elasticsearch Service, is a managed service that makes it easy to deploy, operate, and scale OpenSearch clusters in the AWS Cloud. With the introduction of Amazon OpenSearch Serverless, users can now enjoy a more streamlined and cost-effective way to manage their search and analytics workloads without worrying about the underlying infrastructure. One of the critical tasks in managing an OpenSearch cluster is reindexing, which involves copying data from one index to another. This article will guide you through the process of reindexing in Amazon OpenSearch Serverless using Amazon OpenSearch Ingestion.
## What is Reindexing?
Reindexing is the process of copying documents from one index to another within an OpenSearch cluster. This is often necessary when you need to:
– Change the mapping of an index.
– Upgrade to a new version of OpenSearch.
– Optimize performance by restructuring your data.
– Migrate data between clusters.
## Why Use Amazon OpenSearch Ingestion?
Amazon OpenSearch Ingestion is a fully managed service that simplifies the process of ingesting, transforming, and loading data into Amazon OpenSearch Service. It provides a scalable and reliable way to handle large volumes of data, making it an ideal choice for reindexing tasks. By using Amazon OpenSearch Ingestion, you can:
– Automate the reindexing process.
– Handle large datasets efficiently.
– Ensure data consistency and integrity.
– Minimize downtime and impact on your applications.
## Prerequisites
Before you begin, ensure you have the following:
1. An AWS account with appropriate permissions to access Amazon OpenSearch Service and Amazon OpenSearch Ingestion.
2. An existing Amazon OpenSearch Serverless domain with the source index you want to reindex.
3. AWS CLI or AWS Management Console access.
## Step-by-Step Guide to Reindexing
### Step 1: Create a New Index
First, create a new index in your Amazon OpenSearch Serverless domain where the reindexed data will be stored. You can do this using the AWS Management Console or the AWS CLI.
#### Using AWS Management Console:
1. Navigate to your Amazon OpenSearch Serverless domain.
2. Go to the “Indices” section and click “Create Index.”
3. Define the index name and mappings as required.
#### Using AWS CLI:
“`sh
aws opensearchserverless create-index –domain-name your-domain-name –index-name new-index-name –mappings ‘{
“properties”: {
“field1”: {“type”: “text”},
“field2”: {“type”: “keyword”}
}
}’
“`
### Step 2: Set Up Amazon OpenSearch Ingestion
Next, set up an Amazon OpenSearch Ingestion pipeline to handle the reindexing process.
#### Using AWS Management Console:
1. Navigate to the Amazon OpenSearch Ingestion service.
2. Click “Create Pipeline.”
3. Define the source and destination for your pipeline:
– Source: Your existing index in Amazon OpenSearch Serverless.
– Destination: The new index you created in Step 1.
4. Configure any necessary transformations or filters.
#### Using AWS CLI:
“`sh
aws opensearchingestion create-pipeline –pipeline-name reindex-pipeline –source ‘{
“type”: “opensearch”,
“domain”: “your-domain-name”,
“index”: “source-index-name”
}’ –destination ‘{
“type”: “opensearch”,
“domain”: “your-domain-name”,
“index”: “new-index-name”
}’
“`
### Step 3: Start the Reindexing Process
Once your pipeline is set up, start the reindexing process.
#### Using AWS Management Console:
1. Navigate to your newly created pipeline.
2. Click “Start Pipeline.”
#### Using AWS CLI:
“`sh
aws opensearchingestion start-pipeline –pipeline-name reindex-pipeline
“`
### Step 4: Monitor the Reindexing Process
Monitor the progress of your reindexing task to ensure it completes successfully.
#### Using AWS Management Console:
1. Navigate to your pipeline’s dashboard.
2. Check the status and logs for any errors or issues.
#### Using AWS CLI:
“`sh
aws opensearchingestion describe-pipeline –pipeline-name reindex-pipeline
“`
### Step 5: Validate the New Index
After the reindexing process is complete, validate that the new index contains all the expected data.
#### Using AWS Management Console:
1. Navigate to your Amazon OpenSearch Serverless domain.
2. Go to the “Indices” section and select your new index.
3. Use the built-in search functionality to verify the data.
#### Using AWS CLI:
“`sh
aws opensearchserverless search –domain-name your-domain-name –index-name new-index