Better identification of nested objects

Signed-off-by: Daniel Widdis <[email protected]>

Author: dbwiddis

plugin/src/main/java/org/opensearch/ml/utils/MLNodeUtils.java

@@ -109,14 +109,13 @@ public static String processRemoteInferenceInputDataSetParametersValue(String in
                 if (value.isTextual()) {
                     String textValue = value.asText();
                     try {
-                        // Only try to parse as JSON if it looks like a JSON object or array
-                        if ((textValue.startsWith("{") && textValue.endsWith("}"))
-                            || (textValue.startsWith("[") && textValue.endsWith("]"))) {
-                            // Try to parse the string as JSON
-                            JsonNode parsedValue = mapper.readTree(textValue);
-                            // If successful, replace the string with the parsed JSON
+                        // Try to parse the string as JSON
+                        JsonNode parsedValue = mapper.readTree(textValue);
+                        // Only replace if the parsed value is an object or array
+                        if (parsedValue.isObject() || parsedValue.isArray()) {
                             parametersNode.set(key, parsedValue);
                         } else {
+                            // Leave it as-is if the parsed value is a primitive
                             parametersNode.set(key, value);
                         }
                     } catch (IOException e) {