> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Fusion Server 4.2.5 Release Notes

[localhost link]: http://localhost:3000/docs/4/fusion-server/release-notes/4.2.5-release-notes

[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-server/release-notes/4.2.5-release-notes

[old doc.lw link]: https://doc.lucidworks.com/fusion-server/4.2/90

**Release date:** 22 October 2019

**Component versions:**

|            |                  |             |                        |              |
| ---------- | ---------------- | ----------- | ---------------------- | ------------ |
| Solr 7.7.2 | ZooKeeper 3.4.13 | Spark 2.3.2 | Jetty 9.4.19.v20190610 | Ignite 2.6.0 |

**More information about support dates can be found at [Lucidworks Fusion Product Lifecycle](/docs/policies/lifecycle-policies/lw-fusion-product-lifecycle).**

## New features

### Lucidworks Fusion Smart Answers

Fusion 4.2.5 introduces [Lucidworks Fusion Smart Answers](/docs/4/fusion-ai/concepts/smart-answers/overview), an AI-driven question answering system which combines the power of Solr and neural dense vectors to recommend solutions to users.

### New Rules UI features

Fusion 4.2.5 introduces several new features to the Rules UI:

* Double-click to expand and collapse UI panels.

  <Frame>
    [](/assets/images/4.2/animations/rules-double-click-expand.webm)
  </Frame>

* Drag-and-drop and dropdown reordering for table rows.

  <Frame>
    [](/assets/images/4.2/animations/rules-drag-and-drop.webm)
  </Frame>

* Drag-and-drop for facets.

  <Frame>
    [](/assets/images/4.2/animations/rules-drag-and-drop-facets.webm)
  </Frame>

* Conditionally displayed fields.

  <Frame>
    [](/assets/images/4.2/animations/rules-conditional-fields.webm)
  </Frame>

* Toggle for advanced fields.

  <Frame>
    [](/assets/images/4.2/animations/rules-advanced-toggle.webm)
  </Frame>

* Click to delete table rows.

  <Frame>
    [](/assets/images/4.2/animations/rules-delete-table-rows.webm)
  </Frame>

### Other new features

* Fusion services now support SSL and certificate authentication.

## Improvements

* Improved the default sort behavior for [aggregations](/docs/4/fusion-ai/concepts/signals-and-aggregations/aggregations/overview).

* The SQL query `IS NULL` now seeks out empty values as expected.

* Fixed a bug with the Fusion SQL service that prevented a collection from sharing a name with a collection alias.

* Previously, SQL aggregations were limited to 250 aggregations. Now, the default limit is 5,000 aggregations, and the limit is configurable. To set the limit to 10,000 aggregations, use the following command:

  ```bash wrap theme={"dark"}
  curl -u USERNAME:PASSWORD -X POST -H 'Content-type: application/json' -d '10000' http://localhost:8764/api/apollo/configurations/fusion.sql.bucket_size_limit
  ```

* Improved how multi-word synonyms are handled by [query rewriting](/docs/4/fusion-ai/concepts/query-rewriting/overview).

## Bug Fixes

* Fixed an issue with the [XML Transformation index pipeline stage](/docs/4/fusion-server/reference/pipeline-stages/indexing/xml-transform-index-stage) that prevented it from parsing information from an RSS feed.

* Fixed a bug that sometimes caused the [Token and Phrase Spell Correction Job](/docs/4/fusion-ai/reference/jobs/token-and-phrase-spell-correction) to fail with an `ArrayIndexOutOfBoundsException` error.

* Fixed a bug that prevented security trimming from working on the Alfresco connector in Fusion 4.2.4.

* Fixed a bug that sometimes resulted in documents on CrawlDB being marked as incomplete when crawl operations were started and stopped multiple times.

* Performance is improved in aggregation collections.

* Fixed a bug that caused [Head/Tail Analysis jobs](/docs/4/fusion-ai/reference/jobs/head-tail-analysis) to fail due to a misconfigured collection name.

## Known issues

* The Couchbase connector does not work with Couchbase versions 5 or later. This will be addressed in Fusion 4.2.6.

* The FTP connector sometimes prevents files with non-English filenames from being indexed.