blog en: add 6.1.2 entry

en/_posts/2016-12-31-groonga-6.1.2.md

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+---
+layout: post.en
+title: Groonga 6.1.2 has been released!
+description: Groonga 6.1.2 has been released!
+---
+
+## Groonga 6.1.2 has been released!
+
+[Groonga 6.1.2](/docs/news.html#release-6-1-2) has been released!
+
+How to install in each environment: [Install](/docs/install.html)
+
+### Changes
+
+Here are important changes in this release:
+
+* [load] Supported to show `{"n_loaded_records": N}` in response
+* [load] Supported `--output_ids yes` parameter
+
+#### [load] Supported to show `{"n_loaded_records": N}` in response
+
+In this release, `load` command supports to show how many records are loaded in response.
+
+Here is the example which shows number of loaded records.
+
+    {
+      "header": {
+        "return_code": 0,
+        "start_time": 0.0,
+        "elapsed_time": 0.0
+      },
+      "body": {
+        "n_loaded_records": 2
+      }
+    }
+
+It shows that 2 records are loaded.
+
+Note that `n_loaded_records` is supported by command version 3 or later.
+
+#### [load] Supported `--output_ids yes` parameter
+
+In this release, `--output_ids yes` paremeter is supported.
+
+If `--output_ids yes` is specified, loaded record IDs(loaded_ids) are also returned. ID is 0 for record that is failed to add.
+
+    {
+      "header": {
+        "return_code": 0,
+        "start_time": 0.0,
+        "elapsed_time": 0.0
+      },
+      "body": {
+        "n_loaded_records": 2,
+        "loaded_ids": [
+          1,
+          0,
+          2
+        ]
+      }
+    }
+
+Note that `--output_ids yes` parameter is supported by command version
+3 or later and it is not recommended to use `--output_ids yes` when you loads large number of records in the point of view of performance.
+
+### Conclusions
+
+Please refer to [Release 6.1.2 - 2016-12-31](/docs/news.html#release-6-1-2) about detailed changes since 6.1.1.
+
+Then, let's go all out to search by Groonga!