Synchronizing images from configurable products in Magento 2

This feature is available from 2.1.8 version of Klevu Search extension.
  1. Login into Magento Admin panel
  2. Go to Stores → Configuration → Klevu → Search Configuration
  3. Select the appropriate store view from the Current Configuration Scope
  4. Under the Product Image Settings, select Yes for Use Configurable Product’s Image in Search
  5. Click on Save Config
  6. Once you have changed the settings, please synchronize product updates by following the steps specified at following link :
    Perform on-demand data synchronization