03 Elasticsearch operations

Creating and index: PUT /index_name

Define a mapping:

PUT /my_index/_mapping
{
  "properties": {
    "<field_name>": {
      "type": "text"
    }
  }
}

Retrieve a document using its _id: GET /nyc-restourants/_doc/xxxxxxxxxx

Search

Match:

GET /nyc-restourants/_search
{
  "query": {
    "match": {
      "<field>": <value>
    }
  }
}

Boolean:

GET /nyc-restourants/_search
{
  "query": {
    "bool": {
      "must": [{}],
      "must_not": [{}],
      "should": [{}]
    }
  }
}

Filters

• Exact match
• For fields that are not analyzed
• No relevance
• The filter is either satisfied or not
• Cacheable

GET /nyc-restourants/_search
{
  "query": {
    "bool": {
      "filter": {
        "term": {
          "<field>": <value>
        }
      }
    }
  }
}

GET /nyc-restourants/_search
{
  "query": {
    "bool": {
      "filter": {
        "prefix": {
          "<field>": <value>
        }
      }
    }
  }
}

Count

GET /nyc-restourants/_count
{
  "query": {
    "match": {
      "<field>": <value>
    }
  }
}

Aggregations

GET /nyc-restourants/_search
{
  "size": 0,
  "aggs": {
    "score_group": {
      "term": {
        "field": "<field_name>"
      }
    }
  }
}