Search 6 groundwork - Restore support for "indexNullAs" in @Field

Description

As per our discussion during the F2F
We would use to Elasticsearch's "null_value" concept, and something similar in the Lucene backend.

Note this does not mean we give up the concept of "exists"/"missing" predicates (HSEARCH-2464). We will handle that separately.

Environment

None

Assignee

Fabio Massimo Ercoli

Reporter

Yoann Rodière

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Fix versions

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