container.singleton("extractorFactory", ExtractorFactory.class, factory -> {
    factory.addExtractor("application/custom", container.getComponent("customExtractor"));
});
```

## Advanced Configuration

### Multi-Instance Crawling

```java
// Create multiple crawler instances
Crawler crawler1 = container.getComponent("crawler");
crawler1.setSessionId("session1");

        );
    })
    .error(throwable -> {
        // Handle error
        System.err.println("Error: " + throwable.getMessage());
    });
```

## Advanced Usage

### Index from Existing Documents

```java
import org.codelibs.fess.suggest.index.contents.document.ESSourceReader;

// Index suggestions from existing Elasticsearch documents

    <sub-class-of type="video/x-ms-asf" />
    <glob pattern="*.wmv"/>
    <magic priority="60">
       <match value="Windows Media Video" type="unicodeLE" offset="0:8192" />
       <match value="VC-1 Advanced Profile" type="unicodeLE" offset="0:8192" />
       <match value="wmv2" type="unicodeLE" offset="0:8192" />
    </magic>
  </mime-type>
  <mime-type type="video/x-ms-wmx">
    <glob pattern="*.wmx"/>