import org.hibernate.search.engine.impl.LuceneOptionsImpl;
import org.hibernate.search.engine.metadata.impl.DocumentFieldMetadata;

These would require the free-form entity work first.

import org.hibernate.search.impl.SimpleInitializer

Needs free-form as well.

import org.hibernate.search.impl.SearchMappingBuilder;

Let's promote this to SPI: it's a helper needed by integrators.

import org.hibernate.search.indexes.impl.DirectoryBasedIndexManager;

Designed for extension by IndexManager implementors; We should promote this to SPI too but we're going to break the SPI right now during HSEARCH-1404

import org.hibernate.search.infinispan.impl.InfinispanDirectoryProvider;

This one is needed, let's promote it to SPI.

import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;

Those can be replaced by infinispan loggers, not sure why they are being used on infinispan side

+1