Is it possible to store @IndexedEmbedded fields in parent/root with Hibernate Search?

Question

I am looking for a way to index an embedded objects fields on the root/parent level. So if I have a news article with tags, and that news article contains a picture with tags, I'd like the pictures tags to be index on the top level so I don't have to specify a path into the picture when searching. So when indexing an object like the following…

{
  title: "my news article",
  tags: ["tag1", "tag2"],
  picture: {
    url: "http://domain.com/path/to/image.jpg",
    tags: ["tag2", "tag3"]
  }
}

I'd like to just specify to search only the "tags" field off of my article index and still get a result when searching for the term "tag3".

Something similar to how elastic search can move a nested objects fields to the parent/root with "include_in_parent" and "include_in_parent". Nested Type

Answer 1

There's no straightforward way to accomplish this by annotation config.

But you can use a custom FieldBridge for the picture field. Inside your implementation of the FieldBridge, you will handle the special use case and add the picture.tags elements to the tags field of the index document.