Fusion Server Release NotesSubscribe

Latest Release: 4.2.5 (22 October 2019)

Component Versions

Fusion comes bundled with everything you need to get started.

Solr 7.7.2

ZooKeeper 3.4.13

Spark 2.3.2

Jetty 9.4.19.v20190610

Ignite 2.6.0

New features

Lucidworks Fusion Smart Answers

Fusion 4.2.5 introduces Lucidworks Fusion Smart Answers, an AI-driven question answering system which combines the power of Solr and neural dense vectors to recommend solutions to users.

See the Fusion AI 4.2.5 release notes for more information.

Other New Features

Fusion 4.2.5 introduces several new features to the Rules UI:

  • Double-click to expand and collapse UI panels.

    Double-click to expand and collapse the UI panels.
  • Drag-and-drop and dropdown reordering for table rows.

    Drag-and-drop and dropdown reordering.
  • Drag-and-drop for facets.

    Drag-and-drop for facets.
  • Conditionally displayed fields.

    Conditionally displayed fields.
  • Toggle for advanced fields.

    Toggle for advanced fields.
  • Click to delete table rows.

    Click to delete table rows.


  • 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 an collection alias.

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

    curl -u admin:password123 -X POST -H 'Content-type: application/json' -d '10000' http://localhost:8764/api/apollo/configurations/fusion.sql.bucket_size_limit

Previous releases

5.0.1 (10 October 2019)

Component Versions

Solr 8.2

ZooKeeper 3.4.13

Spark 2.4.3

  • Performance is improved for the logging of the SQL service.

  • Synonym detection is improved to better handle multi-word synonyms.

  • The Cluster, Hosts, Services, and Datasources dashboards are removed from the DevOps center. The Log Viewer dashboard remains.

    DevOps Center Changes

  • Minor changes to the default Spark settings in Kubernetes.

5.0.0 (17 May 2019)

Component Versions

Solr 8.2

ZooKeeper 3.4.13

Spark 2.4.3

Lucidworks Fusion 5.0 lets customers easily deploy AI-powered data discovery and search applications in a modern, containerized architecture with built-in support for rapidly creating interactive dashboards and modern enterprise applications. Customers can leverage existing models and workflows, or create and deploy new ones quickly using popular tools like Python ML, TensorFlow, scikit-learn, and spaCy.


Fusion 5.0 introduces Kubernetes (k8s), an open-source system for automating deployment, scaling, and management of containerized applications, as the recommended Fusion deployment model.

Enforcing best practices

With Kubernetes, Fusion users have a common language to declare how Fusion should be installed, configured, and maintained in production. Instead of focusing on internal implementation details, operations engineers will manage Fusion by monitoring how it uses native Kubernetes resources.

Reducing cost of ownership

Fusion with Kubernetes allows operations engineers to run Fusion, reducing the need for specialized training and internal experts.

Simplifying maintenance and upgrades

Kubernetes allows Fusion users to make zero downtime upgrades simple with rolling updates, minimizing the risks associated with changing a live cluster.

Spring Boot

Traditionally, the cross-cutting concerns of Fusion’s various microservices have been handled with a chassis built and maintained by Lucidworks. Now, Fusion 5.0 employs Spring Boot as its microservice chassis.

Whether Fusion 5.0 is being deployed in a Kubernetes, non-Kubernetes, or on-premises environment, Spring Boot allows Fusion to be deployed using the same underlying framework.

4.2.4 (3 September 2019)

Component Versions

Solr 7.7.2

ZooKeeper 3.4.13

Spark 2.3.2

Jetty 9.4.19.v20190610

Ignite 2.6.0

SharePoint Optimized and SharePoint Online Optimized Connectors

Fusion 4.2.4 introduces ground-up rewrite of our our SharePoint and SharePoint Online connectors. The new connectors, SharePoint V1 Optimized and SharePoint Online V1 Optimized offer a variety of new features and benefits, including:

  • Performance of the initial crawl and incremental crawls have been significantly improved.

  • Security trimming has been centralized so it can be shared between different connector configurations. This is handled by the Active Directory Connector for ACLs.

    SharePoint Optimized Security Trimming

  • More options are available for limiting documents.

    SharePoint Optimized Limit Docs

  • More options are available for customizing crawl performance.

    SharePoint Optimized Crawl Performance

Users are encouraged to upgrade from the classic connectors to the optimized connectors.

Active Directory Connector for ACLs

The new Active Directory Connector for ACLs indexes Active Control List (ACL) information into a configured collection so that it can be used by the SharePoint Optimized and SharePoint Online Optimized connectors.

Active Directory Connector for ACLs

Forked Apache Tika Parser

Fusion Server 4.2.4 adds a new parser, the Forked Apache Tika parser. This parser is a simplified Apache Tika parser geared towards an Enterprise Search crawl in which all documents are parsed in a forked Java Virtual Machine. If memory issues occur while parsing, such as an Out Of Memory condition, the connector job is unaffected.

Forked Tika Parser