ObjectMapper objectMapper = new ObjectMapper();
SimpleModule specModule = new SimpleModule("SpecModule", Version.unknownVersion());
specModule.addSerializer(PhaseFunction.class, new PhaseFunctionSerializer());
specModule.addSerializer(LinkPhase.class, new LinkPhaseSerializer());
specModule.addSerializer(FunctionPhase.class, new FunctionPhaseSerializer());
specModule.addSerializer(BucketInput.class, new BucketInputSerializer());
specModule.addSerializer(SearchInput.class, new SearchInputSerializer());
specModule.addSerializer(BucketKeyInput.class, new BucketKeyInputSerializer());
specModule.addSerializer(IndexInput.class, new IndexInputSerializer());
objectMapper.registerModule(specModule);