@ValidationMethod(message = "loaderPipeline docRef type must be '" + PipelineDoc.TYPE + "'")
        @JsonIgnore
        public boolean isCorrectLoaderType() {
            return loaderPipeline != null && PipelineDoc.TYPE.equals(loaderPipeline.getType());
        }
@return data string or epoch ms
stroom-pipeline/src/main/java/stroom/pipeline/refdata/RefDataLookupRequest.java