Add Search Phase Result Processors to SearchPipelineInfo (opensearch-project#18400)

Signed-off-by: Owais <[email protected]>

Author: owaiskazi19

server/src/main/java/org/opensearch/search/pipeline/SearchPipelineService.java

@@ -476,8 +476,19 @@ public SearchPipelineInfo info() {
             .stream()
             .map(ProcessorInfo::new)
             .collect(Collectors.toList());
+        List<ProcessorInfo> phaseProcessorInfoList = phaseInjectorProcessorFactories.keySet()
+            .stream()
+            .map(ProcessorInfo::new)
+            .collect(Collectors.toList());
         return new SearchPipelineInfo(
-            Map.of(Pipeline.REQUEST_PROCESSORS_KEY, requestProcessorInfoList, Pipeline.RESPONSE_PROCESSORS_KEY, responseProcessorInfoList)
+            Map.of(
+                Pipeline.REQUEST_PROCESSORS_KEY,
+                requestProcessorInfoList,
+                Pipeline.RESPONSE_PROCESSORS_KEY,
+                responseProcessorInfoList,
+                Pipeline.PHASE_PROCESSORS_KEY,
+                phaseProcessorInfoList
+            )
         );
     }
 

server/src/test/java/org/opensearch/search/pipeline/SearchPipelineServiceTests.java

@@ -1068,6 +1068,7 @@ public void testInfo() {
         SearchPipelineInfo info = searchPipelineService.info();
         assertTrue(info.containsProcessor(Pipeline.REQUEST_PROCESSORS_KEY, "scale_request_size"));
         assertTrue(info.containsProcessor(Pipeline.RESPONSE_PROCESSORS_KEY, "fixed_score"));
+        assertTrue(info.containsProcessor(Pipeline.PHASE_PROCESSORS_KEY, "max_score"));
     }
 
     public void testExceptionOnPipelineCreation() {