Ingest does not close its factories

When you implement an ingest factory which implements `Closeable`:

```java
public static final class Factory extends AbstractProcessorFactory<MyProcessor> implements Closeable {
    @Override
    public void close() throws IOException {
        logger.debug("closing my processor factory");
    }
}
```

The `close()` method is never called which could lead to some leak threads when we close a node.

The `ProcessorsRegistry#close()` method exists though and seems to do the right job:

```java
@Override
public void close() throws IOException {
    List<Closeable> closeables = new ArrayList<>();
    for (Processor.Factory factory : processorFactories.values()) {
        if (factory instanceof Closeable) {
            closeables.add((Closeable) factory);
        }
    }
    IOUtils.close(closeables);
}
```

But apparently this method is never called in `Node#stop()`.

Closes #17625.

core/src/main/java/org/elasticsearch/ingest/IngestService.java

@@ -70,6 +70,7 @@ public class IngestService implements Closeable {
 
     @Override
     public void close() throws IOException {
+        pipelineStore.getProcessorRegistry().close();
         pipelineStore.close();
     }
 

core/src/main/java/org/elasticsearch/node/service/NodeService.java

@@ -198,6 +198,7 @@ public class NodeService extends AbstractComponent implements Closeable {
 
     @Override
     public void close() throws IOException {
+        ingestService.close();
         indicesService.close();
     }
 }