fix(generated): use correct setters/constants in postIndex examples

Generated SDK source code using:
- Generator version 3.106.0
- Specification version 1.0.0-dev0.1.28
- Automation (cloudant-sdks) version dfe7806

Author: cloudant-sdks-automation

examples/README.md

@@ -1904,8 +1904,8 @@ Cloudant service = Cloudant.newInstance();
 
 // Type "text" index fields require an object with a name and type properties for the field.
 IndexField field = new IndexField.Builder()
-    .add("name", "address")
-    .add("type", "string")
+    .name("address")
+    .type(IndexField.Type.STRING)
     .build();
 
 IndexDefinition indexDefinition = new IndexDefinition.Builder()

examples/snippets/postIndex/example_request_using_text_type_index.java

@@ -9,8 +9,8 @@
 
 // Type "text" index fields require an object with a name and type properties for the field.
 IndexField field = new IndexField.Builder()
-    .add("name", "address")
-    .add("type", "string")
+    .name("address")
+    .type(IndexField.Type.STRING)
     .build();
 
 IndexDefinition indexDefinition = new IndexDefinition.Builder()