public void testSingleValuedFieldNormalised() throws Exception {
SearchResponse response =
client()
.prepareSearch("idx")
.addAggregation(
dateHistogram("histo")
.field("date")
.dateHistogramInterval(DateHistogramInterval.MONTH)
.minDocCount(0)
.subAggregation(derivative("deriv", "_count").unit(DateHistogramInterval.DAY)))
.execute()
.actionGet();
assertSearchResponse(response);
Histogram deriv = response.getAggregations().get("histo");
assertThat(deriv, notNullValue());
assertThat(deriv.getName(), equalTo("histo"));
List<? extends Bucket> buckets = deriv.getBuckets();
assertThat(buckets.size(), equalTo(3));
DateTime key = new DateTime(2012, 1, 1, 0, 0, DateTimeZone.UTC);
Histogram.Bucket bucket = buckets.get(0);
assertThat(bucket, notNullValue());
assertThat((DateTime) bucket.getKey(), equalTo(key));
assertThat(bucket.getDocCount(), equalTo(1L));
Derivative docCountDeriv = bucket.getAggregations().get("deriv");
assertThat(docCountDeriv, nullValue());
key = new DateTime(2012, 2, 1, 0, 0, DateTimeZone.UTC);
bucket = buckets.get(1);
assertThat(bucket, notNullValue());
assertThat((DateTime) bucket.getKey(), equalTo(key));
assertThat(bucket.getDocCount(), equalTo(2L));
docCountDeriv = bucket.getAggregations().get("deriv");
assertThat(docCountDeriv, notNullValue());
assertThat(docCountDeriv.value(), closeTo(1d, 0.00001));
assertThat(docCountDeriv.normalizedValue(), closeTo(1d / 31d, 0.00001));
key = new DateTime(2012, 3, 1, 0, 0, DateTimeZone.UTC);
bucket = buckets.get(2);
assertThat(bucket, notNullValue());
assertThat((DateTime) bucket.getKey(), equalTo(key));
assertThat(bucket.getDocCount(), equalTo(3L));
docCountDeriv = bucket.getAggregations().get("deriv");
assertThat(docCountDeriv, notNullValue());
assertThat(docCountDeriv.value(), closeTo(1d, 0.00001));
assertThat(docCountDeriv.normalizedValue(), closeTo(1d / 29d, 0.00001));
}
private static void assertBucket(
Histogram.Bucket bucket,
DateTime expectedKey,
long expectedDocCount,
Matcher<Object> derivativeMatcher,
Double derivative,
Double normalizedDerivative) {
assertThat(bucket, notNullValue());
assertThat((DateTime) bucket.getKey(), equalTo(expectedKey));
assertThat(bucket.getDocCount(), equalTo(expectedDocCount));
Derivative docCountDeriv = bucket.getAggregations().get("deriv");
assertThat(docCountDeriv, derivativeMatcher);
if (docCountDeriv != null) {
assertThat(docCountDeriv.value(), closeTo(derivative, 0.00001));
assertThat(docCountDeriv.normalizedValue(), closeTo(normalizedDerivative, 0.00001));
}
}