[Backport 2.x] Fix issue with float field terms query (#12499)

CHANGELOG.md

@@ -46,6 +46,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add a system property to configure YamlParser codepoint limits ([#12298](https://github.com/opensearch-project/OpenSearch/pull/12298))
 - Prevent read beyond slice boundary in ByteArrayIndexInput ([#10481](https://github.com/opensearch-project/OpenSearch/issues/10481))
 - Fix the "highlight.max_analyzer_offset" request parameter with "plain" highlighter ([#10919](https://github.com/opensearch-project/OpenSearch/pull/10919))
+- Fix `terms` query on `float` field when `doc_values` are turned off by reverting back to `FloatPoint` from `FloatField` ([#12499](https://github.com/opensearch-project/OpenSearch/pull/12499))
 - Fix get task API does not refresh resource stats ([#11531](https://github.com/opensearch-project/OpenSearch/pull/11531))
 - Fix for deserilization bug in weighted round-robin metadata ([#11679](https://github.com/opensearch-project/OpenSearch/pull/11679))
 

server/src/internalClusterTest/java/org/opensearch/search/simple/SimpleSearchIT.java

@@ -47,12 +47,14 @@
 import org.opensearch.core.xcontent.XContentParser;
 import org.opensearch.index.IndexSettings;
 import org.opensearch.index.mapper.MapperService;
+import org.opensearch.index.query.ConstantScoreQueryBuilder;
 import org.opensearch.index.query.QueryBuilders;
 import org.opensearch.index.query.TermQueryBuilder;
 import org.opensearch.search.rescore.QueryRescorerBuilder;
 import org.opensearch.search.sort.SortOrder;
 import org.opensearch.test.ParameterizedStaticSettingsOpenSearchIntegTestCase;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -676,6 +678,23 @@ public void testTermQueryBigInt() throws Exception {
         assertEquals(1, searchResponse.getHits().getTotalHits().value);
     }
 
+    public void testIndexOnlyFloatField() throws IOException {
+        prepareCreate("idx").setMapping("field", "type=float,doc_values=false").get();
+        ensureGreen("idx");
+
+        IndexRequestBuilder indexRequestBuilder = client().prepareIndex("idx");
+
+        for (float i = 9000.0F; i < 20000.0F; i++) {
+            indexRequestBuilder.setId(String.valueOf(i)).setSource("{\"field\":" + i + "}", MediaTypeRegistry.JSON).get();
+        }
+        String queryJson = "{ \"filter\" : { \"terms\" : { \"field\" : [ 10000.0 ] } } }";
+        XContentParser parser = createParser(JsonXContent.jsonXContent, queryJson);
+        parser.nextToken();
+        ConstantScoreQueryBuilder query = ConstantScoreQueryBuilder.fromXContent(parser);
+        SearchResponse searchResponse = client().prepareSearch("idx").setQuery(query).get();
+        assertEquals(1, searchResponse.getHits().getTotalHits().value);
+    }
+
     public void testTooLongRegexInRegexpQuery() throws Exception {
         createIndex("idx");
         indexRandom(true, client().prepareIndex("idx").setSource("{}", MediaTypeRegistry.JSON));

server/src/main/java/org/opensearch/index/mapper/NumberFieldMapper.java

@@ -37,7 +37,6 @@
 
 import org.apache.lucene.document.DoublePoint;
 import org.apache.lucene.document.Field;
-import org.apache.lucene.document.FloatField;
 import org.apache.lucene.document.FloatPoint;
 import org.apache.lucene.document.IntPoint;
 import org.apache.lucene.document.LongPoint;
@@ -372,7 +371,7 @@
                 if (hasDocValues) {
                     return SortedNumericDocValuesField.newSlowSetQuery(field, points);
                 }
-                return FloatField.newSetQuery(field, v);
+                return FloatPoint.newSetQuery(field, v);
             }
 
             @Override