diff --git a/test-scripts/20-put-docs.py b/test-scripts/20-put-docs.py
index ee83a26..725ba56 100644
--- a/test-scripts/20-put-docs.py
+++ b/test-scripts/20-put-docs.py
@@ -4,6 +4,7 @@
 import json
 from pathlib import Path
 
+
 def parse_args():
     p = argparse.ArgumentParser()
     p.add_argument("--port", type=int, default=9200)
@@ -15,60 +16,42 @@ def parse_args():
 
 
 def main(args):
-    bulk_data = ""
     if args.no_data:
-        bulk_data = create_bulk_data_nodata(args)
+        es = ElasticSearch(args)
+        for i in range(args.docs):
+            es.put(f"これはドキュメント＃{i}です")
     else:
-        bulk_data = create_bulk_data(args)
-    
+        put_actual(args)
+
+
+es_instance = None
+
+
+def setup_es(args):
+    global es_instance
     es_instance = ElasticSearch(args)
-    es_instance.put(bulk_data)
-    es_instance.refresh()
-
-
-def create_bulk_data_nodata(args):
-    bulk_data = ""
-    for i in range(args.docs):
-        meta_data = {
-            "index" : {
-                "_index": args.index,
-                "_id": i
-
-            }
-        }
-        document_data = {
-            "text": f"これはドキュメント＃{i}です"
-        }
-        bulk_data += json.dumps(meta_data, ensure_ascii=False) + "\n"
-        bulk_data += json.dumps(document_data, ensure_ascii=False) + "\n"
-
-    return bulk_data
-
-def create_bulk_data(args):
-    bulk_data = ""
-    
-    cur_dir = Path(__file__).parent
-    with (cur_dir / "test-sentences.txt").open(encoding="utf-8") as inf:
-        for i, line in enumerate(inf):
-            if i >= args.docs:
-                return bulk_data
 
-            meta_data = {
-                "index" : {
-                    "_index": args.index,
-                    "_id": i
 
-                }
-            }
-            document_data = {
-                "text": line.rstrip()
-            }
-            bulk_data += json.dumps(meta_data, ensure_ascii=False) + "\n"
-            bulk_data += json.dumps(document_data, ensure_ascii=False) + "\n"
+def worker(line, id):
+    global es_instance
+    es_instance.put(line, id)
+
 
-    return bulk_data
+def put_actual(args):
+    cur_dir = Path(__file__).parent
 
+    with Pool(None, setup_es, [args]) as p:
+        futures = []
+        with (cur_dir / "test-sentences.txt").open(encoding="utf-8") as inf:
+            for i, line in enumerate(inf):
+                if i >= args.docs:
+                    return
+                futures.append(p.apply_async(worker, [line.rstrip(), i]))
+        for f in futures:
+            f.wait()
+        print(f"inserted {len(futures)} documents")
 
+    ElasticSearch(args).refresh()
 
 
 class ElasticSearch(object):
@@ -77,18 +60,19 @@ def __init__(self, args):
         self.count = 0
         self.mgr = urllib3.PoolManager()
 
-    def put(self, bulk_data):
-        url = f"{self.url}/_bulk"
+    def put(self, data, doc_id=None):
+        if doc_id is None:
+            doc_id = self.count
+            self.count += 1
+        doc = {"text": data}
+        url = f"{self.url}/_create/{doc_id}"
         r = self.mgr.urlopen(
-            "POST",
+            "PUT",
             url,
             headers={"Content-Type": "application/json"},
-            body=bulk_data.encode('utf-8'),
+            body=json.dumps(doc),
         )
-        if r.status != 200:
-            raise Exception("Failed to POST")
-
-        return
+        return r.data
 
     def refresh(self):
         url = f"{self.url}/_refresh"