---
title: "Backend Modules"
manual: "Apache Solr for TYPO3"
version: "11.2"
source: "Backend/BackendModule.rst"
modified: "2026-09-16T15:10:57+00:00"
---

# Backend Modules

The backend modules are in the "APACHE SOLR" section available and can be unlocked for BE-users or/and groups. The modules help you to do maintenance tasks and get an overview on the system status:

![](../Images/Backend/solr-backend_modules-listing.png)

During the next paragraphs we will go over the modules and explain, what could be done with them.

## Info Module

Info Module shows you important infos about TYPO3 CMS and Solr state.

It contains different info tabs described below:

### Connections

It lists all the for the site configured connections and their status.

![](../Images/Backend/solr-backend-module_Info-Connections.png)

### Statistics

The **Search Statistics** module allows you to see Top Search Phrases with and without results. In addition it possible to see a
complete listing with hits etc. ranked by Top search keywords.

![](../Images/Backend/solr-backend-module_Info-Statistics.png)

### Index Fields

The **Index Fields** module allows you to see, how many documents you have in which solr core and which fields those documents have.

![](../Images/Backend/solr-backend-module_Info-IndexFields.png)

## Core Optimization

Core optimization Module is responsive for managing the behaviour of cores. By modifying of following things, you can also change the ranking and/or the results.

### Stop Words

With the stopwords module you can define a list of words that should be excluded from the search.

![](../Images/Backend/solr-backend-module_CoreOptimization-StopWords.png)

Common usecases are:

-   Very often occurring words like "the", "and" ... are excluded are filtered out because they are more or less "noize words".
-   You can add words that you want to avoid from indexing.

### Synonyms

With the synonyms module you can allow to find documents by words that do not occur in the document but have the same meaning:

-   E.g. smartphone, cellphone, mobile, mobilephone

**Note:** The word that you want replace with a synonym needs to appear on **both** sides when you want to find it with the term itself later

Example

smartphone => smartphone, cellphone, mobile, mobilephone will match "smartphone, cellphone, mobile, mobilephone", when smartphone is missing on the right side, you will not find the document for smartphone anymore!

![](../Images/Backend/solr-backend-module_CoreOptimization-Synonyms.png)

## Index Queue

The **Index Queue** module is the most important module. It allows you to do the following things:

-   Select item types and add them for indexing to the indexing queue.
-   See the fill state of the indexing queue.
-   Check the indexing queue for errors when the indexing of an items failed.
-   Start an instant indexing run, directly from the module.
-   Clear the indexing queue and re-queue items.

![](../Images/Backend/solr-backend-module_IndexQueue.png)

## Index Administration (earlier Index Maintenance)

The **Index Administration** module allows you, to do the following administrative operations on your solr index:

-   Reload the solr configuration.
-   Empty your solr index. This removes all documents from the index of the current selected site.
-   Clear the indexing queue.

![](../Images/Backend/solr-backend-module_IndexAdministration.png)