try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcher(100));
            processor.register(new TestSearcher(0)); // Empty searcher
            processor.register(new TestSearcher(50)); // Half-full searcher
            processor.init();

        final TestSearcher searcher = new TestSearcher();
        // Should be able to call search
        final SearchResult result = searcher.search("test", new TestSearchRequestParams(), OptionalThing.empty());
        assertNotNull(result);
    }

    /**
     * Simple test searcher implementation.
     */
    static class TestSearcher extends RankFusionSearcher {
        @Override

            }
        }
    }

    /**
     * Test searcher that returns configurable number of documents.
     */
    static class TestSearcher extends RankFusionSearcher {
        private final long allRecordCount;

        TestSearcher(long allRecordCount) {
            this.allRecordCount = allRecordCount;
        }

        @Override

            return builder.build();
        }
    }

    /**
     * Normal test searcher for comparison.
     */
    static class TestSearcher extends RankFusionSearcher {
        private final long allRecordCount;

        TestSearcher(long allRecordCount) {
            this.allRecordCount = allRecordCount;
        }

        @Override