}
            if (fieldSet.contains(ACTIVE_SHARDS_PERCENT_AS_NUMBER)) {
                builder.field(ACTIVE_SHARDS_PERCENT_AS_NUMBER, response.getActiveShardsPercent());
            }
            builder.endObject();
            return builder;
        }, XContentType.JSON)) {
            message = ((ByteArrayOutputStream) out).toString(Constants.UTF_8);

            }

            @Override
            public int getNumberOfInFlightFetch() {
                return 0;
            }

            @Override
            public double getActiveShardsPercent() {
                return 100.0;
            }
        };
    }

    // Helper method to create test FessConfig
    private FessConfig createTestFessConfig() {
        return new TestFessConfig();

            engineObj.activePrimaryShards = response.getActivePrimaryShards();
            engineObj.activeShards = response.getActiveShards();
            engineObj.activeShardsPercent = response.getActiveShardsPercent();
            engineObj.relocatingShards = response.getRelocatingShards();
            engineObj.initializingShards = response.getInitializingShards();