assertNotNull(kinds);
        assertEquals(1, kinds.length);
        assertEquals("query", kinds[0]);
    }

    @Test
    public void testParseSource() {
        // Test parseSource method
        Map<String, Object> source = new HashMap<>();
        source.put(FieldNames.TEXT, "parsed text");
        source.put(FieldNames.QUERY_FREQ, 75L);
        source.put(FieldNames.DOC_FREQ, 35L);

    }

    /**
     * Parses a source map and returns a SuggestItem instance.
     * @param source The source map.
     * @return A SuggestItem instance.
     */
    public static SuggestItem parseSource(final Map<String, Object> source) {
        return SuggestItemSerializer.fromSource(source);
    }

    /**
     * Returns the updated source map by merging with existing source.

                firstWords.add(text);
            } else {
                secondWords.add(text);
            }

            if (suggestDetail) {
                final SuggestItem item = SuggestItem.parseSource(source);
                if (isFirstWords) {
                    firstItems.add(item);
                } else {
                    secondItems.add(item);
                }
            }
        }

                if (hits.length == 0) {
                    break;
                }
                for (final SearchHit hit : hits) {
                    final SuggestItem item = SuggestItem.parseSource(hit.getSourceAsMap());
                    freqSetter.accept(item);
                    item.setKinds(Stream.of(item.getKinds()).filter(kind -> kind != kindToRemove).toArray(SuggestItem.Kind[]::new));

            final String text = source.get(FieldNames.TEXT).toString();
            words.add(text);

            if (detail) {
                items.add(SuggestItem.parseSource(source));
            }
        }

        return new PopularWordsResponse(index, searchResponse.getTook().getMillis(), words, searchResponse.getHits().getTotalHits().value(),
                items);
    }