On 9/12/2017 1:35 PM, ruby wrote:
> No index change is happening in this case.

The duplicate document theory that Jason mentioned is one possibility. 
If you have a uniqueKey defined in your schema, then duplicates would
need to have different uniqueKey values.  If you index a document where
the uniqueKey field has the same as an existing document, the existing
document is deleted.

If the index is not changing, and you don't have duplicate documents,
then the only way I can imagine that happening is if there are multiple
replicas of your collection with different numbers of deleted documents.

Deleted documents are still part of the index, so their contents can
affect the scores in your query results.  When different replicas have
different numbers of deleted documents, running the same query more than
once when there is load balancing can have different score-based
ordering on each of those queries.

Multiple replicas with different numbers of deletes is common with
SolrCloud, but it is also possible to have it with a non-SolrCloud
install, though it probably is less likely.

Thanks,
Shawn
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