Add missing api.md

api.md

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+<a name="ElasticsearchBulkIndexWritable"></a>
+## ElasticsearchBulkIndexWritable(client, options)
+A simple wrapper around Elasticsearch for bulk writing items
+
+**Kind**: global function  
+
+| Param | Type | Default | Description |
+| --- | --- | --- | --- |
+| client | <code>Elasticsearch.Client</code> |  | Elasticsearch client |
+| options | <code>Object</code> |  | Options |
+| [options.highWaterMark] | <code>Number</code> | <code>16</code> | Number of items to buffer before writing. Also the size of the underlying stream buffer. |
+| [options.logger] | <code>Object</code> |  | Instance of a logger like bunyan or winston |
+