The Rollup Search endpoint allows searching rolled-up data using the standard query DSL. The Rollup Search endpoint is needed because, internally, rolled-up documents utilize a different document structure than the original data. The Rollup Search endpoint rewrites standard query DSL into a format that matches the rollup documents, then takes the response and rewrites it back to what a client would expect given the original query.
Rollup Search uses the same
SearchRequest that is used by the Search API
but it is mostly for aggregations you should set the
size to 0 and add
aggregations like this:
SearchRequest request = new SearchRequest(); request.source(new SearchSourceBuilder() .size(0) .aggregation(new MaxAggregationBuilder("max_temperature") .field("temperature")));
- Rollup Search is limited in many ways because only some query elements can be translated into queries against the rollup indices. See the main Rollup Search documentation for more.
When executing a
SearchRequest in the following manner, the client waits
SearchResponse to be returned before continuing with code execution:
SearchResponse response = client.rollup().search(request, RequestOptions.DEFAULT);
Synchronous calls may throw an
IOException in case of either failing to
parse the REST response in the high-level REST client, the request times out
or similar cases where there is no response coming back from the server.
In cases where the server returns a
5xx error code, the high-level
client tries to parse the response body error details instead and then throws
ElasticsearchException and adds the original
ResponseException as a
suppressed exception to it.
SearchRequest can also be done in an asynchronous fashion so that
the client can return directly. Users need to specify how the response or
potential failures will be handled by passing the request and a listener to the
asynchronous search method:
The asynchronous method does not block and returns immediately. Once it is
ActionListener is called back using the
if the execution successfully completed or using the
onFailure method if
it failed. Failure scenarios and expected exceptions are the same as in the
synchronous execution case.
A typical listener for
search looks like:
Rollup Search returns the same
SearchResponse that is used by the
Search API and everything can be accessed in exactly the same way.
This will access the aggregation built by the example request above:
NumericMetricsAggregation.SingleValue maxTemperature = response.getAggregations().get("max_temperature"); assertThat(maxTemperature.value(), closeTo(49.0, .00001));