Custom properties can be add to the search index by enabling the `queryable` flag in the Admin Console in Optimizely <<product-name>>. Custom properties will then be treated as text and are added to the `ExactMatch`, `PrefixMatch` and `PhraseMatch` queries during search.

1. Define custom property in the Application Dictionary (see Related topics below).

2. Add `queryable` flag:

   1. Go to **Admin Console** \> **Marketing** \> **_Search_** \> **Field Boosting**.

   2. Find the custom property.

   3. Edit the custom property.

   4. Change **Queryable** to **Yes**.

   5. Adjust boost value as desired.

3. Rebuild the Elasticsearch index.