In this section of the index settings, you can:
- select the language of the search engine.
- define how words are separated.
- select the logical operator among multiple [query rules](/docs/ai-hub/ai-search/query-rules) which contain [Elastic and Static Filter](/docs/ai-hub/ai-search/query-rules#filters) in their consequences.

<figure>
<img src="/api/docs/image/54176ad07f146575310749eba44b7c2f42c1b327/docs/ai-hub/_gfx/ai-search-settings.png" class="full" alt="The configuration of settings in AI Search">
<figcaption>The configuration of settings in AI Search</figcaption>
</figure>

## Configuration
---
1. Go to **AI Hub > Indexes**. 
2. [Create](/docs/ai-hub/ai-search/create-index) or select the index on the list. 
3. Go to the **Settings** tab.
4. On the **Settings** section, click **Define**.

### Selecting language
---
To select the language of the search engine, go to **AI Hub > Indexes**. [Create](/docs/ai-hub/ai-search/create-index) an index or select an existing one from the list. Go to the **Settings** tab. In the **Settings** section, click **Define**.

1. From the dropdown list, select a language.  
2. If you want to display unavailable items in the search results, enable the **Include out of stock items** option. 

### Defining separators
---
This option lets you define how words are separated in your attributes. The attribute values are divided into single searchable words (tokens). 

- The default separator is a space. 
- You can change to the **Standard characters** separator type. The full list of separators is available at [UAX #29: Unicode Text Segmentation](https://unicode.org/reports/tr29/).
- You can also specify custom separators by adding them as [Java Regular Expressions](https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html). All characters specified will be used as separators. 

#### Example
If you want to divide attribute values into words (tokens) based on whitespace characters and the following three characters `. ,` and `/`, enter the following pattern in the **Custom separator** input field:
```
[\s.,\/]+
``` 

### Defining dependency among filters in multiple query rules
---

When two or more query rule conditions are met and their consequences include [filters](/docs/ai-hub/ai-search/query-rules#filters), you can choose the logical operator to combine those filters.

- For static filters, select either **AND** or **OR** in the **Standard filters** section.
- For elastic filters, select either **AND** or **OR** in the **Elastic filters** section.

This flexibility lets you to tune how multiple filters in many query rules interact, enabling more precise targeting and improved control over the resulting data.