7.7.0 Release Notes

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The first generally available version of the Enterprise Search solution including a new Enterprise Search Home section within the UI allowing administrative users to choose which product they want to use.
A new set of public APIs added allowing operators to check the health and collect monitoring information (metrics) of a deployment.
Migration/upgrade code has been changed to provide detailed progress information in the logs making it easier to understand how long an upgrade may take.
Embedded filebeat has been upgraded to 7.6.0.

First version of App Search shipped with the combined Enterprise Search solution.
Added support for automatic migrations from legacy App Search deployments running versions up to 7.6.x to Enterprise Search 7.7. For more information on the upgrade process, see Migrating from App Search to Enterprise Search within the App Search documentation.
Configurable Limits – this version of App Search allows you to change a number of internal product limits for your deployments of the product. Those limits include maximum document size, the limit on the number of fields per engine, full-text query size limits and many others. See the config/enterprise-search.yml configuration file for the full list of configurable limits and their default values.
Telemetry is now enabled by default and can be configured via the config file.

API and Analytics logs and indexes now use ECS-compatible schema by default.
All underlying index names for App Search have changed (index prefix has been changed to .ent-search)
Clickthrough analytics tags now have the same limit as analytics tags for search.

Multiple improvements in read-only mode support, including an ability to perform migrations while in read-only mode and a new UI component notifying users about the read-only mode and its limitations.
Long-running App Search version upgrades had a small chance of failing due to static timeouts on the upgrade process.

Workplace Search is now generally available and is shipped with the combined Enterprise Search solution.
Introduction of Search API endpoints, which provides a programmatic interface for authenticated querying
Document-level permission support for the Google Drive source