code: Builder<BE, Relationship> proceedToRelationships(Relationships.Direction direction) {
          return new Builder<>(this, hop(), Query.filter(), Relationship.class)
                  .hop(new SwitchElementType(direction, false));
      }
docs: The new context will have the source path composed by appending current select candidates to the current source
  path. The new context will have select candidates such that it will select the relationships in given direction
  stemming from the entities on the new source path.
  
  @param direction the direction of the relationships to look for
  @return a context builder with the modified source path, select candidates and type