# Managing indexes in Amazon OpenSearch Service
<a name="managing-indices"></a>

After you add data to Amazon OpenSearch Service, you often need to reindex that data, work with index aliases, move an index to more cost-effective storage, or delete it altogether. This chapter covers storage tiering solutions, Index State Management, and other index operations. For information on the OpenSearch index APIs, see the [OpenSearch documentation](https://docs.opensearch.org/latest/opensearch/reindex-data/).

**Topics**
+ [OpenSearch Optimized Instances for Amazon OpenSearch Service domains](or1.md)
+ [Multi-tier storage for Amazon OpenSearch Service](multi-tier-storage.md)
+ [UltraWarm storage for Amazon OpenSearch Service](ultrawarm.md)
+ [Cold storage for Amazon OpenSearch Service](cold-storage.md)
+ [Index State Management in Amazon OpenSearch Service](ism.md)
+ [Summarizing indexes in Amazon OpenSearch Service with index rollups](rollup.md)
+ [Transforming indexes in Amazon OpenSearch Service](transforms.md)
+ [Cross-cluster replication for Amazon OpenSearch Service](replication.md)
+ [Migrating Amazon OpenSearch Service indexes using remote reindex](remote-reindex.md)
+ [Managing time-series data in Amazon OpenSearch Service with data streams](data-streams.md)