Return static from fluid setters

CHANGELOG.md

@@ -10,6 +10,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added support for PHP 8.3 and 8.4 ([#229](https://github.com/opensearch-project/opensearch-php/pull/229))
 ### Changed
 - Increased min version of `ezimuel/ringphp` to `^1.2.2`
+- Changed fluent setters to return static
 ### Deprecated
 ### Removed
 ### Fixed

util/template/set-bulk-body

@@ -1,5 +1,5 @@
 
-    public function setBody($body): :endpoint
+    public function setBody($body): static
     {
         if (isset($body) !== true) {
             return $this;
@@ -17,4 +17,4 @@
             throw new InvalidArgumentException("Body must be an array, traversable object or string");
         }
         return $this;
-    }
+    }

util/template/set-part

@@ -1,5 +1,5 @@
 
-    public function set:Part($:part): :endpoint
+    public function set:Part($:part): static
     {
         if (isset($:part) !== true) {
             return $this;

util/template/set-part-list

@@ -1,5 +1,5 @@
 
-    public function set:Part($:part): :endpoint
+    public function set:Part($:part): static
     {
         if (isset($:part) !== true) {
             return $this;