Problem

When setting up Confluence to use OpenSearch with AWS request signing, a full reindex take 30% more time than when using basic authentication.

Environment

Confluence v9.2.2

OpenSearch AWS Service 2.11

Steps to Reproduce

Before starting, setup a Confluence instance with at least 1GB of attachment which contains text.

Test basic authentication

1. Configure OpenSearch for basic authentication.

    <property name="opensearch.http.url">https://vpc-xxxxxx.eu-west-1.es.amazonaws.com</property> 

1. Start Confluence.
2. Wait for the UI to be accessible an go to the Content indexing page.
3. Delete all the Confluence indices created in OpenSearch.
4. Trigger a full index rebuild.

Test AWS request signing

1. Configure OpenSearch for AWS request signing.

    <property name="opensearch.aws.host">vpc-xxxxxx.eu-west-1.es.amazonaws.com</property>
    <property name="opensearch.aws.region">eu-west-1</property>
    <property name="opensearch.http.url">https://vpc-xxxxxx.eu-west-1.es.amazonaws.com</property>

1. Start Confluence.
2. Wait for the UI to be accessible an go to the Content indexing page.
3. Delete all the Confluence indices created in OpenSearch.
4. Trigger a full index rebuild.

Expected Results

The reindex process take around the same time in both tests.

Actual Results

Reindexing while using AWS request signing takes 30% more time.

Workaround

Use Basic Authentication until this bug is addressed.

Notes