Fix some documentation bug

README.md

@@ -15,13 +15,12 @@ Load new line delimited JSON(ndjson) files that looks like generated by [wikidat
 
 ## Usage
 
-Sample setting yaml in sample directory 
+Sample setting yaml in sample directory. See [./sample](./sample) directory. 
 
 ### Prepare
 
-**Must to create index before run this command.**
-
-For Elasticsearch, sample index settings/mappings in [./sample/elasticsearch_wiki_extractor_rs](sample/elasticsearch) directory.
+For Elasticsearch, sample index settings/mappings in [./sample](sample) directory.
+This sample mapping came from [wikidata-filter](https://github.com/johtani/wikidata-filter) json.
 
 ### Load command
 Show help with the following command::
@@ -33,6 +32,6 @@ $ .target/release/bin/bulk2es -h
 #### Options
 
 ```
-$ ./bulk2es -c <SEARCH_ENGINE_CONFIG> -s <SEARCH_ENGINE_TYPE> <INPUT_DIR>
+$ ./bulk2es -c <SEARCH_ENGINE_CONFIG> <INPUT_DIR>
 ```
 

sample/es.yaml

@@ -1,6 +1,10 @@
+# url to elasticsearch cluster
 url: "http://192.168.1.24:9200"
+# bulk size
 buffer_size: 3000
+# index name
 index_name: wikidata_test
+# set absolute file path or relative file path from directory that command run.
 schema_file: "./sample/sample_schema.json"
 id_field_name: "id"
 # if output Elastic Cloud Elasticsearch Service, need to set these 3 settings.