elasticsearch - 使用弹性聚合 (NEST) 时出现 null_pointer_exception
问题描述
我想使用弹性 (6.2.4) 呈现方面。
一个方面应该为特定字段中的每个值提供一个值和包含该值的文档数(按文档数 desc 排序)。
根据文档,我认为我需要使用术语聚合。
这是我的代码:
var indexName = "newindx";
ElasticClient client = new ElasticClient(
new ConnectionSettings(
new SingleNodeConnectionPool(
new Uri(@"http://localhost:9200"))
).DefaultIndex(indexName)
.IncludeServerStackTraceOnError(true)
);
client.CreateIndex(indexName, c => c
.Mappings(ms => ms
.Map(typeof(Document), m => m
.AutoMap(typeof(Document))
))
);
var d1 = new Document()
{
id = 1,
name = "aa"
};
var d2 = new Document()
{
id = 2,
name = "aa"
};
var d3 = new Document()
{
id = 3,
name = "bb"
};
client.Index(d1, i => i.Index(indexName).Type(typeof(Document)).Refresh(Refresh.True));
client.Index(d2, i => i.Index(indexName).Type(typeof(Document)).Refresh(Refresh.True));
client.Index(d3, i => i.Index(indexName).Type(typeof(Document)).Refresh(Refresh.True));
var searchResults = client.Search<Document>(s => s
.Query(q => q.MatchAll())
.Aggregations(aggs => aggs.Children<Document>("name_agg", child => child
.Aggregations(childAggs => childAggs
.Terms("name_agg_vs", vc => vc.Field("name"))
)
)
)
);
我已经创建并索引了 3 个文档,并且希望按名称获得 2 个聚合(值“aa”的文档 1 和 2,值“bb”的文档 3)。
相反,我得到一个“null_pointer_exception”
; nested: NullPointerException;
at org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:619)
at org.elasticsearch.action.search.SearchPhaseExecutionException.guessRootCauses(SearchPhaseExecutionException.java:170)
at org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:617)
at org.elasticsearch.ElasticsearchException.generateFailureXContent(ElasticsearchException.java:564)
at org.elasticsearch.rest.BytesRestResponse.build(BytesRestResponse.java:138)
at org.elasticsearch.rest.BytesRestResponse.<init>(BytesRestResponse.java:96)
at org.elasticsearch.rest.BytesRestResponse.<init>(BytesRestResponse.java:91)
at org.elasticsearch.rest.action.RestActionListener.onFailure(RestActionListener.java:58)
at org.elasticsearch.action.support.TransportAction$1.onFailure(TransportAction.java:91)
at org.elasticsearch.action.search.AbstractSearchAsyncAction.raisePhaseFailure(AbstractSearchAsyncAction.java:222)
at org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseFailure(AbstractSearchAsyncAction.java:274)
at org.elasticsearch.action.search.AbstractSearchAsyncAction.executeNextPhase(AbstractSearchAsyncAction.java:132)
at org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseDone(AbstractSearchAsyncAction.java:243)
at org.elasticsearch.action.search.InitialSearchPhase.onShardFailure(InitialSearchPhase.java:107)
at org.elasticsearch.action.search.InitialSearchPhase.access$100(InitialSearchPhase.java:49)
at org.elasticsearch.action.search.InitialSearchPhase$2.lambda$onFailure$1(InitialSearchPhase.java:217)
at org.elasticsearch.action.search.InitialSearchPhase.maybeFork(InitialSearchPhase.java:171)
at org.elasticsearch.action.search.InitialSearchPhase.access$000(InitialSearchPhase.java:49)
at org.elasticsearch.action.search.InitialSearchPhase$2.onFailure(InitialSearchPhase.java:217)
at org.elasticsearch.action.search.SearchExecutionStatsCollector.onFailure(SearchExecutionStatsCollector.java:73)
at org.elasticsearch.action.ActionListenerResponseHandler.handleException(ActionListenerResponseHandler.java:51)
at org.elasticsearch.action.search.SearchTransportService$ConnectionCountingHandler.handleException(SearchTransportService.java:527)
at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleException(TransportService.java:1098)
at org.elasticsearch.transport.TransportService$DirectResponseChannel.processException(TransportService.java:1191)
at org.elasticsearch.transport.TransportService$DirectResponseChannel.sendResponse(TransportService.java:1175)
at org.elasticsearch.transport.TaskTransportChannel.sendResponse(TaskTransportChannel.java:66)
at org.elasticsearch.action.search.SearchTransportService$6$1.onFailure(SearchTransportService.java:385)
at org.elasticsearch.search.SearchService$2.onFailure(SearchService.java:324)
at org.elasticsearch.search.SearchService$2.onResponse(SearchService.java:318)
at org.elasticsearch.search.SearchService$2.onResponse(SearchService.java:312)
at org.elasticsearch.search.SearchService$3.doRun(SearchService.java:1002)
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:672)
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
at org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:41)
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at org.elasticsearch.join.aggregations.ChildrenAggregationBuilder.joinFieldResolveConfig(ChildrenAggregationBuilder.java:106)
at org.elasticsearch.join.aggregations.ChildrenAggregationBuilder.resolveConfig(ChildrenAggregationBuilder.java:97)
at org.elasticsearch.search.aggregations.support.ValuesSourceAggregationBuilder.doBuild(ValuesSourceAggregationBuilder.java:287)
at org.elasticsearch.search.aggregations.support.ValuesSourceAggregationBuilder.doBuild(ValuesSourceAggregationBuilder.java:36)
at org.elasticsearch.search.aggregations.AbstractAggregationBuilder.build(AbstractAggregationBuilder.java:132)
at org.elasticsearch.search.aggregations.AggregatorFactories$Builder.build(AggregatorFactories.java:329)
at org.elasticsearch.search.SearchService.parseSource(SearchService.java:749)
at org.elasticsearch.search.SearchService.createContext(SearchService.java:558)
at org.elasticsearch.search.SearchService.createAndPutContext(SearchService.java:534)
at org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:330)
at org.elasticsearch.search.SearchService$2.onResponse(SearchService.java:316)
... 9 more
我使用的每个聚合(不仅仅是术语)都会发生这种情况,所以我想我在做一些根本错误的事情。
解决方案
var searchResults = client.Search<Document>(s => s
.Query(q => q.MatchAll())
.Aggregations(aggs => aggs
.Terms("names", vc => vc
.Field("name")
)
)
);
var termsAggregation = searchResults.Aggregations.Terms("names");
foreach (var termBucket in termsAggregation.Buckets)
{
// do something with buckets
Console.WriteLine(termBucket.Key);
Console.WriteLine(termBucket.Count);
}
child
当您有父/子关系时使用聚合。
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