I have a custom indexing value which is a combination of two labels of (facetables) fields.

But, I'm able to define it as facetable, but it is not indexed like it.

To be facetable, I was forced to implement CustomMetadataIndexingField instead of CustomIndexingField, then I create a foo MetadataDefinition with an empty StaticEnumerator.

But during indexation, the CustomIndexingField facetable status is ignored (SolrContentIndexer.indexModelFields(...)), we use indexValues(...) method which considering that all string fields are not facetables.