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* the Apache License, Version 2.0 (the "License"); you may
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* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
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package org.elasticsearch.search.aggregations.bucket.sampler;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.SortedNumericDocValuesField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import org.elasticsearch.index.analysis.AnalyzerScope;
import org.elasticsearch.index.analysis.NamedAnalyzer;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.NumberFieldMapper;
import org.elasticsearch.index.mapper.TextFieldMapper.TextFieldType;
import org.elasticsearch.search.aggregations.AggregatorTestCase;
import org.elasticsearch.search.aggregations.metrics.min.Min;
import org.elasticsearch.search.aggregations.metrics.min.MinAggregationBuilder;
import java.io.IOException;
public class SamplerAggregatorTests extends AggregatorTestCase {
/**
* Uses the sampler aggregation to find the minimum value of a field out of the top 3 scoring documents in a search.
*/
public void testSampler() throws IOException {
TextFieldType textFieldType = new TextFieldType();
textFieldType.setIndexAnalyzer(new NamedAnalyzer("foo", AnalyzerScope.GLOBAL, new StandardAnalyzer()));
MappedFieldType numericFieldType = new NumberFieldMapper.NumberFieldType(NumberFieldMapper.NumberType.LONG);
numericFieldType.setName("int");
IndexWriterConfig indexWriterConfig = newIndexWriterConfig();
indexWriterConfig.setMaxBufferedDocs(100);
indexWriterConfig.setRAMBufferSizeMB(100); // flush on open to have a single segment with predictable docIds
try (Directory dir = newDirectory();
IndexWriter w = new IndexWriter(dir, indexWriterConfig)) {
for (long value : new long[] {7, 3, -10, -6, 5, 50}) {
Document doc = new Document();
StringBuilder text = new StringBuilder();
for (int i = 0; i < value; i++) {
text.append("good ");
}
doc.add(new Field("text", text.toString(), textFieldType));
doc.add(new SortedNumericDocValuesField("int", value));
w.addDocument(doc);
}
SamplerAggregationBuilder aggBuilder = new SamplerAggregationBuilder("sampler")
.shardSize(3)
.subAggregation(new MinAggregationBuilder("min")
.field("int"));
try (IndexReader reader = DirectoryReader.open(w)) {
assertEquals("test expects a single segment", 1, reader.leaves().size());
IndexSearcher searcher = new IndexSearcher(reader);
Sampler sampler = searchAndReduce(searcher, new TermQuery(new Term("text", "good")), aggBuilder, textFieldType,
numericFieldType);
Min min = sampler.getAggregations().get("min");
assertEquals(5.0, min.getValue(), 0);
}
}
}
}