Add more test case (from opensearch-project#446)

Signed-off-by: Andriy Redko <drreta@gmail.com>

Author: reta

spring-data-opensearch/src/test/java/org/opensearch/data/client/core/index/DynamicTemplatesContextBaseTests.java

@@ -56,6 +56,15 @@ void shouldCreateDynamicTemplateOne() {
     }
 
 
+    @Test
+    void shouldCreateDynamicTemplateOneWithDot() {
+        IndexOperations indexOperations = operations.indexOps(SampleDynamicTemplatesEntity.class);
+        assertThat(indexOperations.createWithMapping()).isTrue();
+
+        operations.save(new SampleDynamicTemplatesEntity(Map.of("John.Jr", "Smith")));
+        assertThat(operations.search(Query.findAll(), SampleDynamicTemplatesEntity.class).get().count()).isEqualTo(1L);
+    }
+
     @Test
     void shouldCreateDynamicTemplateTwo() {
         IndexOperations indexOperations = operations.indexOps(SampleDynamicTemplatesEntityTwo.class);