AWS OpenSearch Serverless index creation delay

When creating an index in Amazon OpenSearch Serverless (AOSS), it's normal to experience a short delay before the index becomes fully operational. This delay is due to the service provisioning and initializing the necessary resources for your new index.

Unfortunately, there isn't a direct way to programmatically determine when an index is ready for use. The best practice is to implement a retry mechanism with exponential backoff in your application when creating indexes and ingesting data.

To minimize errors when sending data immediately after index creation:

1. Implement error handling in your code to catch and properly handle 500 Internal Server errors and other potential issues.

2. Use a retry mechanism with exponential backoff. This means if an operation fails, wait for a short period before retrying, and increase the wait time between subsequent retries.

3. Consider adding a fixed delay (e.g., 30 seconds) after creating an index before attempting to ingest data. While this isn't ideal for all use cases, it can help avoid immediate errors.

4. Monitor the relevant CloudWatch metrics for your collection, such as IngestionRequestErrors and IngestionRequestSuccess. These metrics can give you insight into when your index starts successfully accepting data.

5. If you're creating multiple indexes in quick succession, consider implementing a queue system to manage index creation and data ingestion tasks.

Remember that while these strategies can help mitigate issues, they don't guarantee immediate availability of the index. The exact time needed for an index to become fully operational can vary based on factors like collection size, current load, and service optimizations.
Sources
Monitoring OpenSearch Serverless with Amazon CloudWatch - Amazon OpenSearch Service
Unable to Create Index in OpenSearch Serverless: Error 507 | AWS re:Post