[ML] Use INTERNAL_INGEST for Inference (#127522)

Inference now inspects InputType and validates it before sending it to
the model. INTERNAL_INGEST has special privileges for model validation
that will help pass during ingestion.

docs/changelog/127522.yaml

@@ -0,0 +1,6 @@
+pr: 127522
+summary: Use INTERNAL_INGEST for Inference
+area: Machine Learning
+type: bug
+issues:
+ - 127519

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/action/filter/ShardBulkInferenceActionFilter.java

@@ -433,7 +433,15 @@ public class ShardBulkInferenceActionFilter implements MappedActionFilter {
                 }
             };
             inferenceProvider.service()
-                .chunkedInfer(inferenceProvider.model(), null, inputs, Map.of(), InputType.INGEST, TimeValue.MAX_VALUE, completionListener);
+                .chunkedInfer(
+                    inferenceProvider.model(),
+                    null,
+                    inputs,
+                    Map.of(),
+                    InputType.INTERNAL_INGEST,
+                    TimeValue.MAX_VALUE,
+                    completionListener
+                );
         }
 
         /**