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Hi Friends,

Currently working on migrating a site to Umbraco 12 and I'm having an issue with indexing after upgrading.

English is the default site language, but is not mandatory, as we have news articles which can in exist in German (for example) but not in English. English is set as the fallback language for German.

The issue is articles that exist and are published in German, but  do not have an English version, are not being indexed when using the rebuild external index function in the backoffice > examine management. I can confirm that the German articles are indexed correctly when published individually. 

I have debugged the `PublishedContentIndexPopulator`  and can see that the content is being passed to `index.IndexItems`  to be indexed. Furthermore I have also debugged the `ContentValueSetValidator` and can see that the value set is valid, and identical to the value set that is generated when the content is published directly.

Could anyone offer some insights/have any experience dealing with a similar issue?

Many thanks,
Pav

The issue turned out to be that the tags field 'tags_en-gb' needed to be configured as below:
`facetsConfig.SetMultiValued("tags_en-gb", true);`
Using Examine 4 beta.