When updating a document with the index API, we read the original document, make our changes, and then reindex the whole document in one go. The most recent indexing request wins: whichever document was indexed last is the one stored in Elasticsearch. If somebody else had changed the document in the meantime, their changes would be lost.index API를 사용하여 document를 업데이트하는 경우, 원래의 document를 읽고, 변경을 ..