Add note about using text_similarity for rerank to the CLI (#716)

eland/cli/eland_import_hub_model.py

@@ -41,7 +41,9 @@ MODEL_HUB_URL = "https://huggingface.co"
 def get_arg_parser():
     from eland.ml.pytorch.transformers import SUPPORTED_TASK_TYPES
 
-    parser = argparse.ArgumentParser()
+    parser = argparse.ArgumentParser(
+        exit_on_error=False
+    )  # throw exception rather than exit
     location_args = parser.add_mutually_exclusive_group(required=True)
     location_args.add_argument(
         "--url",
@@ -97,7 +99,7 @@ def get_arg_parser():
         "--task-type",
         required=False,
         choices=SUPPORTED_TASK_TYPES,
-        help="The task type for the model usage. Will attempt to auto-detect task type for the model if not provided. "
+        help="The task type for the model usage. Use text_similarity for rerank tasks. Will attempt to auto-detect task type for the model if not provided. "
         "Default: auto",
         default="auto",
     )
@@ -159,6 +161,23 @@ def get_arg_parser():
     return parser
 
 
+def parse_args():
+    parser = get_arg_parser()
+    try:
+        return parser.parse_args()
+    except argparse.ArgumentError as argument_error:
+        if argument_error.argument_name == "--task-type":
+            message = (
+                argument_error.message
+                + "\n\nUse 'text_similarity' for rerank tasks in Elasticsearch"
+            )
+            parser.error(message=message)
+        else:
+            parser.error(message=argument_error.message)
+    except argparse.ArgumentTypeError as type_error:
+        parser.error(str(type_error))
+
+
 def get_es_client(cli_args, logger):
     try:
         es_args = {
@@ -262,7 +281,7 @@ def main():
     assert SUPPORTED_TASK_TYPES
 
     # Parse arguments
-    args = get_arg_parser().parse_args()
+    args = parse_args()
 
     # Connect to ES
     logger.info("Establishing connection to Elasticsearch")