Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Asynchronous search in Amazon OpenSearch Service

With asynchronous search for Amazon OpenSearch Service you can submit a search query that gets executed in the background, monitor the progress of the request, and retrieve results at a later stage. You can retrieve partial results as they become available before the search has completed. After the search finishes, save the results for later retrieval and analysis.

Asynchronous search requires OpenSearch 1.0 or later, or Elasticsearch 7.10 or later. Full documentation for asynchronous search, including detailed steps and API descriptions, is available in the OpenSearch documentation.

Sample search call

To perform an asynchronous search, send HTTP requests to _plugins/_asynchronous_search using the following format:

POST opensearch-domain/_plugins/_asynchronous_search

You can specify the following asynchronous search options:

Sample request

POST _plugins/_asynchronous_search/?pretty&size=10&wait_for_completion_timeout=1ms&keep_on_completion=true&request_cache=false
{
  "aggs": {
    "city": {
      "terms": {
        "field": "city",
        "size": 10
      }
    }
  }
}

Asynchronous search permissions

Asynchronous search supports fine-grained access control. For details on mixing and matching permissions to fit your use case, see Asynchronous search security.

For domains with fine-grained access control enabled, you need the following minimum permissions for a role:

# Allows users to use all asynchronous search functionality
asynchronous_search_full_access:
  reserved: true
  cluster_permissions:
    - 'cluster:admin/opensearch/asynchronous-search/*'
  index_permissions:
    - index_patterns:
        - '*'
      allowed_actions:
        - 'indices:data/read/search*'

# Allows users to read stored asynchronous search results
asynchronous_search_read_access:
  reserved: true
  cluster_permissions:
    - 'cluster:admin/opensearch/asynchronous-search/get'

For domains with fine-grained access control disabled, use your IAM access and secret key to sign all requests. You can access the results with the asynchronous search ID.

Asynchronous search settings

OpenSearch lets you change all available asynchronous search settings using the _cluster/settings API. In OpenSearch Service, you can only change the following settings:

Cross-cluster search

You can perform an asynchronous search across clusters with the following minor limitations:

If you set up a connection between domain-a -> domain-b with connection alias cluster_b and domain-a -> domain-c with connection alias cluster_c, asynchronously search domain-a, domain-b, and domain-c as follows:

POST https://src-domain.us-east-1.es.amazonaws.com/local_index,cluster_b:b_index,cluster_c:c_index/_plugins/_asynchronous_search/?pretty&size=10&wait_for_completion_timeout=500ms&keep_on_completion=true&request_cache=false 
{
  "size": 0,
  "_source": {
    "excludes": []
  },
  "aggs": {
    "2": {
      "terms": {
        "field": "clientip",
        "size": 50,
        "order": {
          "_count": "desc"
        }
      }
    }
  },
  "stored_fields": [
    "*"
  ],
  "script_fields": {},
  "docvalue_fields": [
    "@timestamp"
  ],
  "query": {
    "bool": {
      "must": [
        {
          "query_string": {
            "query": "status:404",
            "analyze_wildcard": true,
            "default_field": "*"
          }
        },
        {
          "range": {
            "@timestamp": {
              "gte": 1483747200000,
              "lte": 1488326400000,
              "format": "epoch_millis"
            }
          }
        }
      ],
      "filter": [],
      "should": [],
      "must_not": []
    }
  }
}

Response

{
  "id" : "Fm9pYzJyVG91U19xb0hIQUJnMHJfRFEAAAAAAAknghQ1OWVBczNZQjVEa2dMYTBXaTdEagAAAAAAAAAB",
  "state" : "RUNNING",
  "start_time_in_millis" : 1609329314796,
  "expiration_time_in_millis" : 1609761314796
}

For more information, see Cross-cluster search in Amazon OpenSearch Service.

UltraWarm

Asynchronous searches with UltraWarm indexes continue to work. For more information, see UltraWarm storage for Amazon OpenSearch Service.