Elasticsearch command note

1. command for look up mapping document

GET /books

2. command for count document

GET /books/_count

3. command for look up document

GET /books/_search

5. command for reindex from old to new

• if put parameter wait_for_completion = false will separate work and can monitor task with command GET _tasks/{{task-id}}

POST _reindex?wait_for_completion=false
{
  "source": {
    "index": "books"
  },
  "dest": {
    "index": "new-books"
  }
}

6. command for mapping new field to existing index

• example is add filed keyword in name and use analyzer is keyword
  and min character for begin to cut is 10 and max is 20

PUT /books/_mapping
{
    "properties": {
      "name": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "text",
            "analyzer": "keyword",
            "index_prefixes": {
              "min_chars": 10,
              "max_chars": 20
            }
          }
        }
      }
    }
}

7. update data for new index

• conflicts is proceed is mean not index if another index is processing

POST books/_update_by_query?conflicts=proceed&wait_for_completion=false