plperron opened a new pull request #1423: LUCENE-9314: Match a document with MemoryIndex on LuceneMonitor URL: https://github.com/apache/lucene-solr/pull/1423 see [LUCENE-9314](https://issues.apache.org/jira/browse/LUCENE-9314) <!-- _(If you are a project committer then you may remove some/all of the following template.)_ Before creating a pull request, please file an issue in the ASF Jira system for Lucene or Solr: * https://issues.apache.org/jira/projects/LUCENE * https://issues.apache.org/jira/projects/SOLR You will need to create an account in Jira in order to create an issue. The title of the PR should reference the Jira issue number in the form: * LUCENE-####: <short description of problem or changes> * SOLR-####: <short description of problem or changes> LUCENE and SOLR must be fully capitalized. A short description helps people scanning pull requests for items they can work on. Properly referencing the issue in the title ensures that Jira is correctly updated with code review comments and commits. --> # Description Lucene monitor function, match single document, wraps a single document into a array of documents. Hence, it always calls the function, match many documents, which build a MultiDocumentBatch rather than a SingletonDocumentBatch. The former uses ByteBuffersDirectory while later uses MemoryIndex. As per documentation, MemoryIndex is a high-performance single-document main memory Apache Lucene fulltext search index. Hence, Lucene monitor should use it when matching a single document. # Solution The solution is to call DocumentBatch.of with a single document rather than an array of document. # Tests The feature was already there but seems to have been overlook when moving the original project [Luwak](https://github.com/flaxsearch/luwak) to Lucene. The tests still pass. # Checklist Please review the following and check all that apply: - [X] I have reviewed the guidelines for [How to Contribute](https://wiki.apache.org/solr/HowToContribute) and my code conforms to the standards described there to the best of my ability. - [X] I have created a Jira issue and added the issue ID to my pull request title. - [X] I have given Solr maintainers [access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork) to contribute to my PR branch. (optional but recommended) - [X] I have developed this patch against the `master` branch. - [X] I have run `ant precommit` and the appropriate test suite. - [X] I have added tests for my changes. - [ ] I have added documentation for the [Ref Guide](https://github.com/apache/lucene-solr/tree/master/solr/solr-ref-guide) (for Solr changes only).
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