* Remove build-opensearch-image.yml -- the published image is unused * MM-68248: Support OpenSearch v3 * MM-68248: Add CI job to test OpenSearch v2 backwards compatibility * MM-68248: Handle missing indexes gracefully before reindex OpenSearch v3 rejects _update_by_query and _delete_by_query with no index argument (405), and returns index_not_found_exception (404) when querying an exact index name that hasn't been created yet. Both arise before any reindex has run, since indexes are created on first document write. Return nil/empty instead of an error from all affected operations, and add test coverage for each in the no-indexes state. * MM-68248: Fix copy-paste operation names in DeleteFilesBatch * MM-68248: Add i18n string for delete_files_batch error * Revert "MM-68248: Add i18n string for delete_files_batch error" This reverts commite885678088. * Revert "MM-68248: Fix copy-paste operation names in DeleteFilesBatch" This reverts commit4b7caacf59. * Revert "MM-68248: Handle missing indexes gracefully before reindex" This reverts commit2d2d522f86.
Mattermost is an open core, self-hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
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- Download and Install Mattermost - Install, setup, and configure your own Mattermost instance.
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Table of contents
- Install Mattermost
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- Get security bulletins
- Get involved
- Learn more
- License
- Get the latest news
- Contributing
Install Mattermost
- Download and Install Mattermost Self-Hosted - Deploy a Mattermost Self-hosted instance in minutes via Docker, Ubuntu, or tar.
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In addition to the web interface, you can also download Mattermost clients for Android, iOS, Windows PC, macOS, and Linux.
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Contributing
Please see CONTRIBUTING.md. Join the Mattermost Contributors server to join community discussions about contributions, development, and more.




