# General reference for Amazon OpenSearch Service
<a name="genref"></a>

 Amazon OpenSearch Service supports a variety of instances, operations, plugins, and other resources.

**Topics**
+ [Cost optimization techniques for Amazon OpenSearch Service](cost-optimization.md)
+ [Supported instance types in Amazon OpenSearch Service](supported-instance-types.md)
+ [Features by engine version in Amazon OpenSearch Service](features-by-version.md)
+ [Plugins by engine version in Amazon OpenSearch Service](supported-plugins.md)
+ [Supported operations in Amazon OpenSearch Service](supported-operations.md)
+ [Amazon OpenSearch Service quotas](limits.md)
+ [Reserved Instances in Amazon OpenSearch Service](ri.md)
+ [Other supported resources in Amazon OpenSearch Service](supported-resources.md)