Fix json array extraction properly...

src/main/kotlin/SearchDocTransform.kt

@@ -102,14 +102,26 @@ class SearchDocTransform(mapping: String) {
                 Pair(targetField, value)
             is JsonObject ->
                 Pair(targetField, mapOf(Pair(value["@language"], value["@value"])))
-            is JsonArray<*> ->
-                Pair(targetField, value.mapNotNull {
+            is JsonArray<*> -> {
+                val results = value.mapNotNull {
                     when (it) {
                         is String -> it
                         is JsonObject -> Pair(it["@language"], it["@value"])
                         else -> null
                     }
-                })
+                }
+                when {
+                    results.isEmpty() -> {
+                        null
+                    }
+                    results[0] is String -> {
+                        Pair(targetField, results)
+                    }
+                    else -> {
+                        Pair(targetField, (results as List<Pair<Any, Any>>).toMap())
+                    }
+                }
+            }
             else -> {
                 log.error("Could not parse literal value: $value.")
                 null