code: static <T> LocalUniqueIndex<T> create( String name,
                                             String workspaceName,
                                             DB db,
                                             Converter<T> converter,
                                             BTreeKeySerializer<T> valueSerializer,
                                             Serializer<T> rawSerializer ) {
          return new LocalUniqueIndex<>(name, workspaceName, db, converter, valueSerializer, rawSerializer);
      }
docs: Create a new index that allows only a single value for each unique key.
  
  @param name the name of the index; may not be null or empty
  @param workspaceName the name of the workspace; may not be null
  @param db the database in which the index information is to be stored; may not be null
  @param converter the converter from {@link StaticOperand} to values being indexed; may not be null
  @param valueSerializer the serializer for the type of value being indexed; may not be null
  @param rawSerializer the raw value serializer for the type of value being indexed; may not be null
  @return the new index; never null