Message Title

Reducing the scope to only remove @IndexedEmbedded.indexNullAs

@FieldContext.indexNullAs will stay, as explained in HSEARCH-3099 Open .

Change By:	Yoann Rodière
Summary:	Drop support for @ Field.indexNullAs / @ IndexedEmbedded.indexNullAs

We Elasticsearch doesn't support "null_value" for object fields, and does not support setting a string value (our null token) to an object field either, so I don't see how we can only consider this removal if get the same kind of queries we manage had with the Lucene backend ("path. to resolve .embedded:__null__") working.

Let's give up on this feature, and implement "exists" predicates for object fields ( HSEARCH- 2464 2389) instead . Otherwise, we would harm a great many users.

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