public void processDocumentOperations(List<DocumentOperation> documentOperations) {
        processDocumentOperations(documentOperations, null);
    }
Asynchronously process the given document operations as one unit
using the processing chain of this service.

@throws RuntimeException caused by a QueueFullException if this DocprocService has a bounded input queue and the queue is full
@throws IllegalStateException if this DocprocService is not accepting new incoming processings
docproc/src/main/java/com/yahoo/docproc/impl/DocprocService.java