Support dotted field names in counted_keyword (elastic#102283)

With this commit we correctly handle dotted field names in the recently
introduced `counted_keyword` field type.

Relates elastic#101826

x-pack/plugin/mapper-counted-keyword/src/main/java/org/elasticsearch/xpack/countedkeyword/CountedKeywordFieldMapper.java

@@ -281,7 +281,7 @@ public FieldMapper build(MapperBuilderContext context) {
                 name,
                 FIELD_TYPE,
                 new CountedKeywordFieldType(
-                    name,
+                    context.buildFullName(name),
                     true,
                     false,
                     true,

x-pack/plugin/mapper-counted-keyword/src/test/java/org/elasticsearch/xpack/countedkeyword/CountedKeywordFieldMapperTests.java

@@ -7,15 +7,19 @@
 
 package org.elasticsearch.xpack.countedkeyword;
 
+import org.apache.lucene.index.IndexableField;
+import org.elasticsearch.index.mapper.DocumentMapper;
 import org.elasticsearch.index.mapper.MappedFieldType;
 import org.elasticsearch.index.mapper.MapperTestCase;
+import org.elasticsearch.index.mapper.ParsedDocument;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.junit.AssumptionViolatedException;
 
 import java.io.IOException;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 
 public class CountedKeywordFieldMapperTests extends MapperTestCase {
     @Override
@@ -67,4 +71,15 @@ protected SyntheticSourceSupport syntheticSourceSupport(boolean ignoreMalformed)
     protected IngestScriptSupport ingestScriptSupport() {
         throw new AssumptionViolatedException("not supported");
     }
+
+    public void testDottedFieldNames() throws IOException {
+        DocumentMapper mapper = createDocumentMapper(mapping(b -> {
+            b.startObject("dotted.field");
+            b.field("type", CountedKeywordFieldMapper.CONTENT_TYPE);
+            b.endObject();
+        }));
+        ParsedDocument doc = mapper.parse(source(b -> b.field("dotted.field", "1234")));
+        List<IndexableField> fields = doc.rootDoc().getFields("dotted.field");
+        assertEquals(1, fields.size());
+    }
 }