public static Processing createProcessingFromDocumentOperations(String service,
                                                                    List<DocumentOperation> documentsAndUpdates,
                                                                    CallStack callStack) {
        return new Processing(service, documentsAndUpdates, callStack, null, false);
    }
Creates a Processing from a list of operations.

@param service               the unique name of the service processing this
@param documentsAndUpdates   the document operation list. This <b>transfers ownership</b> of this list
                             to this class. The caller <i>must not</i> modify it
@param callStack             the document processors to call in this processing.
                             This <b>transfers ownership</b> of this structure
                             to this class. The caller <i>must not</i> modify it
docproc/src/main/java/com/yahoo/docproc/Processing.java