在Elasticsearch中导入和更新数据

We have an existing search function that involves data across multiple tables in SQL Server. This causes a heavy load on our DB, so I'm trying to find a better way to search through this data (it doesn't change very often). I have been working with Logstash and Elasticsearch for about a week using an import containing 1.2 million records. My question is essentially, "how do I update existing documents using my 'primary key'"?We have an existing search function that involv