Right now filter aggregations run in "compatible" mode if the top level query is `bool: {filter: { match_all: {}}}}` - but this really just just `match_all` in disguise. We should just run in filter-by-filter mode here.
server/src/test/java/org/elasticsearch/search/aggregations/bucket/filter/FiltersAggregatorTests.java
*/
        Collections.shuffle(docs, random());
        debugTestCase(
            builder,
            new MatchAllDocsQuery(),
            iw -> iw.addDocuments(docs),
            (InternalFilters filters, Class<? extends Aggregator> impl, Map<String, Map<String, Object>> debug) -> {
                assertThat(filters.getBuckets(), hasSize(buckets.size()));
                InternalFilters.InternalBucket b = filters.getBucketByKey("2010-01-01 to 2010-01-31");
                assertThat(b.getDocCount(), equalTo(3334L));
                Max max = b.getAggregations().get("m");
                assertThat(max.value(), equalTo(9999.0));
                Sum sum = b.getAggregations().get("s");
                assertThat(sum.value(), equalTo(16668333.0));
                b = filters.getBucketByKey("2019-12-10 to 2020-01-09");
                assertThat(b.getDocCount(), equalTo(6666L));
                max = b.getAggregations().get("m");
                assertThat(max.value(), equalTo(9998.0));
                sum = b.getAggregations().get("s");
                assertThat(sum.value(), equalTo(33326667.0));
                assertThat(impl, equalTo(FilterByFilterAggregator.class));
                assertMap(
                    debug,
                    matchesMap().entry(
                        "test",
                        matchesMap().entry("segments_with_doc_count_field", 0)
                            .entry("segments_with_deleted_docs", 0)
                            .entry("segments_collected", greaterThanOrEqualTo(1))
                            .entry("segments_counted", 0)
                            .entry("filters", hasSize(buckets.size()))