> ## 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 AI 4.2.2 Release Notes

[localhost link]: http://localhost:3000/docs/4/fusion-ai/release-notes/4.2.2-release-notes

[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-ai/release-notes/4.2.2-release-notes

[old doc.lw link]: https://doc.lucidworks.com/fusion-ai/4.2/432

**Release date:** 17 May 2019

**Component versions:**

|          |                  |             |                        |              |
| -------- | ---------------- | ----------- | ---------------------- | ------------ |
| Solr 7.5 | ZooKeeper 3.4.13 | Spark 2.3.2 | Jetty 9.4.12.v20180830 | 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

No new features were introduced in Fusion AI 4.2.2.

See the [Fusion Server 4.2.2 release notes](/docs/4/fusion-server/release-notes/4.2.2-release-notes) for other changes.

## Improvements

* [Synonym pairs](/docs/4/fusion-ai/concepts/query-rewriting/synonym-detection) are now grouped and treated as one term when for better compatibility with [Solr’s "minimum match" (`mm`) query parameter](https://solr.apache.org/guide/solr/latest/query-guide/dismax-query-parser.html).

* [Query rewriting](/docs/4/fusion-ai/concepts/query-rewriting/overview) accuracy is improved in this release.

* [Parallel Bulk Loader (PBL) jobs](/docs/4/fusion-ai/reference/jobs/parallel-bulk-loader) and [Script jobs](/docs/4/fusion-server/reference/jobs/script) can now be configured to set environment variables. In the Fusion UI, click **Advanced** to see this option.

* Recommender jobs are no longer scheduled by default; they must now be scheduled manually or run on demand. (Previously, default recommender jobs were automatically scheduled to run after the `_user_item_preferences_aggregation` job.)

## Other changes

* The Spark driver now writes `error.log` and `output.log` files to `var/log/api` instead of `var/api/work`.

* [Query Rewriting UI](/docs/4/fusion-ai/concepts/query-rewriting/overview) bug fixes:

  * Fixed an issue in Fusion Server 4.2.0 and 4.2.1 that caused the UI’s search feature to return a `Problem with underlying storage` when a query was `:` followed by an additional query term.
  * Fixed a bug that caused the Query Rewriting UI to display an error window that could not be closed.

* Signals from the [Simulator](/docs/4/fusion-ai/concepts/query-rewriting/simulator) are no longer sent to the signals collection.

* Fixed an issue in the [Text Tagger query stage](/docs/4/fusion-ai/reference/query-pipeline-stages/text-tagger-query-stage) which prevented query rewrites from working after **Save Tags in Context** had been enabled.

* [Business rules](/docs/4/fusion-ai/concepts/query-rewriting/business-rules) defined with tags are no longer triggered by queries that contain no `tags` parameters.