[SOLR-9528] Make _docid_ (lucene id) a pseudo field

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 7.0
• Assignee: Unassigned
• Reporter: Alexandre Rafalovitch
• Created: 18/Sep/16 02:28
• Updated: 08/Jun/19 15:33

Description

Lucene document id is a transitory id that cannot be relied on as it can change on document updates, etc.

However, there are circumstances where it could be useful to use it in a search. The primarily use is a debugging where some error messages provide only lucene document id as the reference. For example:

child query must only match non-parent docs, but parent docID=38200 matched childScorer=class org.apache.lucene.search.DisjunctionSumScorer

We already expose the lucene id with [docid] transformer with _docid_ sorting.

On the email list, [e-mail] proposed that docid should be a legitimate pseudo-field, which would make it returnable, usable in function queries, etc.

Issue Links

• is related to: LUCENE-7452 improve exception message: child query must only match non-parent docs, but parent docID=180314...
• relates to: LUCENE-4968 Several ToParentBlockJoinQuery/Collector issues