Migrating to 7.14edit

This section discusses the changes that you need to be aware of when migrating your application to Elasticsearch 7.14.

See also What’s new in 7.15 and Release notes.

Breaking changesedit

The following changes in Elasticsearch 7.14 might affect your applications and prevent them from operating normally. Before upgrading to 7.14, review these changes and take the described steps to mitigate the impact.

Breaking changes introduced in minor versions are normally limited to security and bug fixes. Significant changes in behavior are deprecated in a minor release and the old behavior is supported until the next major release. To find out if you are using any deprecated functionality, enable deprecation logging.

Cluster changesedit

Version barrier applies to all upgrades

Details
If a failure occurs during a rolling upgrade then Elasticsearch may prematurely conclude that the upgrade is complete and enable functionality which is incompatible with earlier versions. In versions before 7.14 Elasticsearch would accept older nodes into the cluster after completing the upgrade despite having enabled incompatible functionality, as long as the older nodes were from the same major series. From 7.14 onwards Elasticsearch will not accept any older nodes into a fully-upgraded cluster.

Impact
If a failure occurs during a rolling upgrade and older nodes cannot rejoin the cluster then you must upgrade the affected nodes. Once upgraded, they will join the cluster again.

Deprecationsedit

The following functionality has been deprecated in Elasticsearch 7.14 and will be removed in 8.0. While this won’t have an immediate impact on your applications, we strongly encourage you take the described steps to update your code after upgrading to 7.14.

Significant changes in behavior are deprecated in a minor release and the old behavior is supported until the next major release. To find out if you are using any deprecated functionality, enable deprecation logging.

Core deprecationsedit

Setting cluster.routing.allocation.disk.watermark.enable_for_single_data_node=false is deprecated.

Details
The setting cluster.routing.allocation.disk.watermark.enable_for_single_data_node should never be explicitly set to false. In 8.0, the only legal value will be true. In a future release, the setting will be removed completely, with same behavior as if the setting was true.

Impact

If your cluster has a single data node then set cluster.routing.allocation.disk.watermark.enable_for_single_data_node: true to opt in to the future behaviour today. If you wish to disable the disk watermarks then set cluster.routing.allocation.disk.threshold_enabled: false.

If your cluster has multiple data nodes then the cluster.routing.allocation.disk.watermark.enable_for_single_data_node setting has no effect and you should discontinue its use.

Search deprecationsedit

The geo_bounding_box query’s type parameter is deprecated.

Details
The geo_bounding_box query’s type parameter has been deprecated in 7.14.0. This parameter is a no-op and has no effect on the query.

Impact
Discontinue use of the type parameter in geo_bounding_box queries.

Security deprecationsedit

The default behavior of disabling security on basic and trial licenses is deprecated

Details
Currently, security features are disabled when operating on a basic or trial license when xpack.security.enabled has not been explicitly set to true. This behavior is now deprecated. In version 8.0.0, security features will be enabled by default for all licenses, unless explicitly disabled (by setting xpack.security.enabled to false).

Configuring a realm name with a leading underscore is deprecated.

Details
Elasticsearch creates "synthetic" realm names on the fly for services like API keys. These synthetic realm names are prefixed with an underscore. Currently, user configured realms can also be given a name with a leading underscore. This creates confusion since realm names are meant to be unique for a node.

Impact
Configuring a realm name with a leading underscore is deprecated. In a future release of Elasticsearch it will result in an error on startup if any user configured realm has a name with a leading underscore.

CCR deprecationsedit

Auto-follow remote system indices is deprecated.

Details
Currently, remote system indices matching an auto-follow pattern are configured as a follower index automatically, this behavior is deprecated.

Impact
In 8.0.0, remote system indices matching an auto-follow pattern won’t be configured as a follower index automatically. In order to adapt to this new behaviour it is advised to exclude patterns matching system indices such as .tasks and kibana-*.