# Amazon OpenSearch Serverless

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/amazon-opensearch-service-developer-guide.git)
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## What is Amazon OpenSearch Serverless?

* **Note**\
  Collections with unique AWS KMS keys can't share OCUs with other collections.

## Managing capacity limits

* **Note**\
  Although capacity can scale up to accomodate data, it can't currently scale up *search* replicas. OpenSearch Serverless functions with two search replicas running in active-active mode. If you need more replicas for your workload, contact [AWS Support](https://console.aws.amazon.com/support/home).
* **Note**\
  At this time, capacity settings only apply at the account level. You can't configure per-collection capacity limits.

## Ingesting data into collections

* **Note**\
  You must have version 2.30.0 or later of the AWS for Fluent Bit image in order to integrate with OpenSearch Serverless.