queryContext.addFunctionScore(list -> {
            list.add(new FilterFunctionBuilder(QueryBuilders.termQuery("status", "active"),
                    ScoreFunctionBuilders.weightFactorFunction(2.0f)));
        });

        QueryBuilder result = queryContext.getQueryBuilder();
        assertNotNull(result);
        assertTrue(result instanceof FunctionScoreQueryBuilder);
    }

            flist.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.prefixQuery(FieldNames.TEXT, query),
                    ScoreFunctionBuilders.weightFactorFunction(prefixMatchWeight)));
        }

        flist.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(ScoreFunctionBuilders.fieldValueFactorFunction(FieldNames.DOC_FREQ)
                .missing(0.1f)

                        queryMap.put(termKey, boostList);
                    }
                    boostList.add(
                            new Tuple3<>(keyMatch.getId(), boolQuery, ScoreFunctionBuilders.weightFactorFunction(keyMatch.getBoost())));
                } else if (logger.isDebugEnabled()) {
                    logger.debug("No KeyMatch boost docs");
                }

                waitForNext();

        assertTrue(context.sortBuilders().get(0).toString().contains("_score"));
    }

    @Test
    public void test_addBoostFunction_scoreFunction() {
        queryHelper.addBoostFunction(ScoreFunctionBuilders.weightFactorFunction(2.0f));

        QueryContext context = buildQuery("test");
        // Verify that function score query contains the added boost function