Here you will find information about:

• limitations,
• known issues,
• changes in the supported environments,
• any unexpected behvavior of Optimize (e.g due to a new feature)

Changes in the supported environments

With this Optimize version the supported versions of Elasticsearch also change. Now, Optimize only connects to versions 6.2.0 and later. See the Supported Environments sections for the details. Hence, you need to upgrade Elasticsearch to use the new Optimize version. See the general Elasticsearch Upgrade Guide on how to do that. Usually, the only thing you need to do is to perform a rolling upgrade.

Known issues

Confusing warning during the upgrade

On executing the upgrade you may see the following warning a couple of times in the upgrade log output:

Deprecated big difference between max_gram and min_gram in NGram Tokenizer, expected difference must be less than or equal to: [1]

You can safely ignore this warning. The upgrade itself amends the relevant index settings so the warning will be resolved.

Misinterpreted cron expressions

The configuration of Optimize allows you to define when the history cleanup is triggered using Cron expression notation. However, the values are incorrectly interpreted in Optimize. For example, the historyCleanup.cronTrigger configuration has the default value 0 1 * * *, which should be 01:00 AM every day. Unfortunately, a bug causes this to be interpreted as every hour.

To fix this just use the spring cron expression notation. For instance, the default value for historyCleanup.cronTrigger would then be 0 0 1 * * *.