Revert "Throw exception if decay is requested for a field with multiple values"

This reverts commit 95d781510f9ec66b6615df4e26ccc18da9c2b155.

see https://github.com/elasticsearch/elasticsearch/issues/3960#issuecomment-41279373

src/main/java/org/elasticsearch/index/query/functionscore/DecayFunctionParser.java

@@ -22,7 +22,6 @@ package org.elasticsearch.index.query.functionscore;
 import org.apache.lucene.index.AtomicReaderContext;
 import org.apache.lucene.search.ComplexExplanation;
 import org.apache.lucene.search.Explanation;
-import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ElasticsearchIllegalArgumentException;
 import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.common.geo.GeoDistance;
@@ -284,9 +283,6 @@ public abstract class DecayFunctionParser implements ScoreFunctionParser {
         @Override
         public void setNextReader(AtomicReaderContext context) {
             geoPointValues = fieldData.load(context).getGeoPointValues();
-            if (geoPointValues.isMultiValued()) {
-                throw new ElasticsearchException("Field " + fieldData.getFieldNames().fullName() + " is multy valued. Cannot compute decay for more than one value.");
-            }
         }
 
         private final GeoPoint getValue(int doc, GeoPoint missing) {
@@ -334,9 +330,6 @@ public abstract class DecayFunctionParser implements ScoreFunctionParser {
 
         public void setNextReader(AtomicReaderContext context) {
             this.doubleValues = this.fieldData.load(context).getDoubleValues();
-            if (doubleValues.isMultiValued()) {
-                throw new ElasticsearchException("Field " + fieldData.getFieldNames().fullName() + "is multy valued. Cannot compute decay for more than one value.");
-            }
         }
 
         private final double getValue(int doc, double missing) {

src/test/java/org/elasticsearch/search/functionscore/DecayFunctionScoreTests.java

@@ -702,40 +702,5 @@ public class DecayFunctionScoreTests extends ElasticsearchIntegrationTest {
                                         "multiply"))));
         response.actionGet();
     }
-    
-    @Test
-    public void testMultiValuedFieldException() throws Throwable {
-        assertAcked(prepareCreate("test").addMapping(
-                "type",
-                jsonBuilder().startObject().startObject("type").startObject("properties").startObject("test").field("type", "string")
-                        .endObject().startObject("num").field("type", "double").endObject().startObject("geo").field("type", "geo_point")
-                        .endObject().endObject().endObject().endObject()));
-        ensureYellow();
-        double[] numVals = { 1.0, 2.0, 3.0 };
-
-        client().index(
-                indexRequest("test").type("type").source(
-                        jsonBuilder().startObject().field("test", "value").field("num", numVals).field("geo").startArray().startObject()
-                                .field("lat", 1).field("lon", 1).endObject().startObject().field("lat", 1).field("lon", 2).endObject().endArray()
-                                .endObject())).actionGet();
-        refresh();
-        SearchResponse response = client().prepareSearch("test")
-                .setQuery(functionScoreQuery().add(new MatchAllFilterBuilder(), linearDecayFunction("num", 1, 0.5)).scoreMode("multiply"))
-                .execute().actionGet();
-
-        assertThat(response.getShardFailures().length, equalTo(1));
-        assertThat(response.getHits().getHits().length, equalTo(0));
-        
-        List<Float> lonlat = new ArrayList<Float>();
-        lonlat.add(new Float(1));
-        lonlat.add(new Float(1));
-        
-        response = client().prepareSearch("test")
-                .setQuery(functionScoreQuery().add(new MatchAllFilterBuilder(), linearDecayFunction("geo", lonlat, "1000km")).scoreMode("multiply"))
-                .execute().actionGet();
-
-        assertThat(response.getShardFailures().length, equalTo(1));
-        assertThat(response.getHits().getHits().length, equalTo(0));
-    }
 
 }