Amazon OpenSearch Serverless Now Supports up to 10,000 Collections Per Collection Group
AWS, Monday, August 10th, 2026
Amazon OpenSearch Serverless raises the ceiling to 10,000 collections per collection group, up from 1,500.
The next generation of Amazon OpenSearch Serverless now supports up to 10,000 collections within a single collection group, up from a previous limit of 1,500.
Collection groups organise multiple collections and let them share OpenSearch Compute Units even when collections are encrypted with different AWS KMS keys.
The higher limit lets customers consolidate far more collections into one group and manage them under a shared set of capacity limits. Customers use collection groups to cut costs by sharing compute across many collections instead of provisioning separate OCUs per KMS key. Collection-level security is maintained throughout.