Addressed comments

Signed-off-by: Dev Agarwal <[email protected]>

plugins/telemetry-otel/src/main/java/org/opensearch/telemetry/OTelTelemetrySettings.java

@@ -133,7 +133,7 @@ private OTelTelemetrySettings() {}
                     return (Class<Sampler>) loader.loadClass(sampler);
                 });
             } catch (PrivilegedActionException ex) {
-                throw new IllegalStateException("Unable to load sampler class:", ex.getCause());
+                throw new IllegalStateException("Unable to load sampler class: " + sampler, ex.getCause());
             }
         },
         Setting.Property.NodeScope,