The processor with ID 'solr_densevector' could not be retrieved for index 'Solr'.

Please read the README for Search API Solr on how to generate and update XML configuration sets for Solr. It will do the necessary work and not require manual XML editing.

Just as an update here:

1. On first index creation, go to the Processors tab.
2. Enable the DenseVector processor.
3. Configure the processor - first select the provider and save, then reload and pick the AI model (this will be improved later).
4. Save.

This should fix it. Why it errors on first creation of an index I am not sure of yet.

This is because the event subscriber fires when the module is enabled and the event subscriber loads the processor from the index and runs operations. Now there is a check first to see that solr_densevector is a valid processor before continuing. However, if you remove this processor, you should also remove any 'Dense Vector' field configured on the index because it will fail at index time trying to store non vectorized value into the vector field in Solr.

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