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Index and search data using Elasticsearch APIs

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Index and search data using Elasticsearch APIs

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This quick start guide is a hands-on introduction to the fundamental concepts of Elasticsearch: indices, documents and field type mappings.

You’ll learn how to create an index, add data as documents, work with dynamic and explicit mappings, and perform your first basic searches.

The code examples in this tutorial are in Console syntax by default. You can convert into other programming languages in the Console UI.

Requirements

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You’ll need a running Elasticsearch cluster, together with Kibana to use the Dev Tools API Console. Run the following command in your terminal to set up a single-node local cluster in Docker:

curl -fsSL https://elastic.co/start-local | sh

Step 1: Create an index

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Create a new index named books:

const response = await client.indices.create({
  index: "books",
});
console.log(response);
PUT /books

The following response indicates the index was created successfully.

Example response 
{
  "acknowledged": true,
  "shards_acknowledged": true,
  "index": "books"
}

Step 2: Add data to your index

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This tutorial uses Elasticsearch APIs, but there are many other ways to add data to Elasticsearch.

You add data to Elasticsearch as JSON objects called documents. Elasticsearch stores these documents in searchable indices.

Add a single document

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Submit the following indexing request to add a single document to the books index.

If the index didn’t already exist, this request would automatically create it.

const response = await client.index({
  index: "books",
  document: {
    name: "Snow Crash",
    author: "Neal Stephenson",
    release_date: "1992-06-01",
    page_count: 470,
  },
});
console.log(response);
POST books/_doc
{
  "name": "Snow Crash",
  "author": "Neal Stephenson",
  "release_date": "1992-06-01",
  "page_count": 470
}

The response includes metadata that Elasticsearch generates for the document, including a unique _id for the document within the index.

Example response 
{
  "_index": "books", 
  "_id": "O0lG2IsBaSa7VYx_rEia", 
  "_version": 1, 
  "result": "created", 
  "_shards": { 
    "total": 2, 
    "successful": 2, 
    "failed": 0 
  },
  "_seq_no": 0, 
  "_primary_term": 1 
}

The _index field indicates the index the document was added to.

The _id field is the unique identifier for the document.

The _version field indicates the version of the document.

The result field indicates the result of the indexing operation.

The _shards field contains information about the number of shards that the indexing operation was executed on and the number that succeeded.

The total field indicates the total number of shards for the index.

The successful field indicates the number of shards that the indexing operation was executed on.

The failed field indicates the number of shards that failed during the indexing operation. 0 indicates no failures.

The _seq_no field holds a monotonically increasing number incremented for each indexing operation on a shard.

The _primary_term field is a monotonically increasing number incremented each time a primary shard is assigned to a different node.

Add multiple documents

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Use the _bulk endpoint to add multiple documents in one request. Bulk data must be formatted as newline-delimited JSON (NDJSON).

resp = client.bulk(
    operations=[
        {
            "index": {
                "_index": "books"
            }
        },
        {
            "name": "Revelation Space",
            "author": "Alastair Reynolds",
            "release_date": "2000-03-15",
            "page_count": 585
        },
        {
            "index": {
                "_index": "books"
            }
        },
        {
            "name": "1984",
            "author": "George Orwell",
            "release_date": "1985-06-01",
            "page_count": 328
        },
        {
            "index": {
                "_index": "books"
            }
        },
        {
            "name": "Fahrenheit 451",
            "author": "Ray Bradbury",
            "release_date": "1953-10-15",
            "page_count": 227
        },
        {
            "index": {
                "_index": "books"
            }
        },
        {
            "name": "Brave New World",
            "author": "Aldous Huxley",
            "release_date": "1932-06-01",
            "page_count": 268
        },
        {
            "index": {
                "_index": "books"
            }
        },
        {
            "name": "The Handmaids Tale",
            "author": "Margaret Atwood",
            "release_date": "1985-06-01",
            "page_count": 311
        }
    ],
)
print(resp)
response = client.bulk(
  body: [
    {
      index: {
        _index: 'books'
      }
    },
    {
      name: 'Revelation Space',
      author: 'Alastair Reynolds',
      release_date: '2000-03-15',
      page_count: 585
    },
    {
      index: {
        _index: 'books'
      }
    },
    {
      name: '1984',
      author: 'George Orwell',
      release_date: '1985-06-01',
      page_count: 328
    },
    {
      index: {
        _index: 'books'
      }
    },
    {
      name: 'Fahrenheit 451',
      author: 'Ray Bradbury',
      release_date: '1953-10-15',
      page_count: 227
    },
    {
      index: {
        _index: 'books'
      }
    },
    {
      name: 'Brave New World',
      author: 'Aldous Huxley',
      release_date: '1932-06-01',
      page_count: 268
    },
    {
      index: {
        _index: 'books'
      }
    },
    {
      name: 'The Handmaids Tale',
      author: 'Margaret Atwood',
      release_date: '1985-06-01',
      page_count: 311
    }
  ]
)
puts response
const response = await client.bulk({
  operations: [
    {
      index: {
        _index: "books",
      },
    },
    {
      name: "Revelation Space",
      author: "Alastair Reynolds",
      release_date: "2000-03-15",
      page_count: 585,
    },
    {
      index: {
        _index: "books",
      },
    },
    {
      name: "1984",
      author: "George Orwell",
      release_date: "1985-06-01",
      page_count: 328,
    },
    {
      index: {
        _index: "books",
      },
    },
    {
      name: "Fahrenheit 451",
      author: "Ray Bradbury",
      release_date: "1953-10-15",
      page_count: 227,
    },
    {
      index: {
        _index: "books",
      },
    },
    {
      name: "Brave New World",
      author: "Aldous Huxley",
      release_date: "1932-06-01",
      page_count: 268,
    },
    {
      index: {
        _index: "books",
      },
    },
    {
      name: "The Handmaids Tale",
      author: "Margaret Atwood",
      release_date: "1985-06-01",
      page_count: 311,
    },
  ],
});
console.log(response);
POST /_bulk
{ "index" : { "_index" : "books" } }
{"name": "Revelation Space", "author": "Alastair Reynolds", "release_date": "2000-03-15", "page_count": 585}
{ "index" : { "_index" : "books" } }
{"name": "1984", "author": "George Orwell", "release_date": "1985-06-01", "page_count": 328}
{ "index" : { "_index" : "books" } }
{"name": "Fahrenheit 451", "author": "Ray Bradbury", "release_date": "1953-10-15", "page_count": 227}
{ "index" : { "_index" : "books" } }
{"name": "Brave New World", "author": "Aldous Huxley", "release_date": "1932-06-01", "page_count": 268}
{ "index" : { "_index" : "books" } }
{"name": "The Handmaids Tale", "author": "Margaret Atwood", "release_date": "1985-06-01", "page_count": 311}

You should receive a response indicating there were no errors.

Example response 
{
  "errors": false,
  "took": 29,
  "items": [
    {
      "index": {
        "_index": "books",
        "_id": "QklI2IsBaSa7VYx_Qkh-",
        "_version": 1,
        "result": "created",
        "_shards": {
          "total": 2,
          "successful": 2,
          "failed": 0
        },
        "_seq_no": 1,
        "_primary_term": 1,
        "status": 201
      }
    },
    {
      "index": {
        "_index": "books",
        "_id": "Q0lI2IsBaSa7VYx_Qkh-",
        "_version": 1,
        "result": "created",
        "_shards": {
          "total": 2,
          "successful": 2,
          "failed": 0
        },
        "_seq_no": 2,
        "_primary_term": 1,
        "status": 201
      }
    },
    {
      "index": {
        "_index": "books",
        "_id": "RElI2IsBaSa7VYx_Qkh-",
        "_version": 1,
        "result": "created",
        "_shards": {
          "total": 2,
          "successful": 2,
          "failed": 0
        },
        "_seq_no": 3,
        "_primary_term": 1,
        "status": 201
      }
    },
    {
      "index": {
        "_index": "books",
        "_id": "RUlI2IsBaSa7VYx_Qkh-",
        "_version": 1,
        "result": "created",
        "_shards": {
          "total": 2,
          "successful": 2,
          "failed": 0
        },
        "_seq_no": 4,
        "_primary_term": 1,
        "status": 201
      }
    },
    {
      "index": {
        "_index": "books",
        "_id": "RklI2IsBaSa7VYx_Qkh-",
        "_version": 1,
        "result": "created",
        "_shards": {
          "total": 2,
          "successful": 2,
          "failed": 0
        },
        "_seq_no": 5,
        "_primary_term": 1,
        "status": 201
      }
    }
  ]
}

Step 3: Define mappings and data types

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Mappings define how data is stored and indexed in Elasticsearch, like a schema in a relational database.

Use dynamic mapping

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When using dynamic mapping, Elasticsearch automatically creates mappings for new fields by default. The documents we’ve added so far have used dynamic mapping, because we didn’t specify a mapping when creating the index.

To see how dynamic mapping works, add a new document to the books index with a field that doesn’t appear in the existing documents.

const response = await client.index({
  index: "books",
  document: {
    name: "The Great Gatsby",
    author: "F. Scott Fitzgerald",
    release_date: "1925-04-10",
    page_count: 180,
    language: "EN",
  },
});
console.log(response);
POST /books/_doc
{
  "name": "The Great Gatsby",
  "author": "F. Scott Fitzgerald",
  "release_date": "1925-04-10",
  "page_count": 180,
  "language": "EN" 
}

The new field.

View the mapping for the books index with the Get mapping API. The new field new_field has been added to the mapping with a text data type.

const response = await client.indices.getMapping({
  index: "books",
});
console.log(response);
GET /books/_mapping
Example response 
{
  "books": {
    "mappings": {
      "properties": {
        "author": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "name": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "new_field": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "page_count": {
          "type": "long"
        },
        "release_date": {
          "type": "date"
        }
      }
    }
  }
}

Define explicit mapping

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Create an index named my-explicit-mappings-books with explicit mappings. Pass each field’s properties as a JSON object. This object should contain the field data type and any additional mapping parameters.

const response = await client.indices.create({
  index: "my-explicit-mappings-books",
  mappings: {
    dynamic: false,
    properties: {
      name: {
        type: "text",
      },
      author: {
        type: "text",
      },
      release_date: {
        type: "date",
        format: "yyyy-MM-dd",
      },
      page_count: {
        type: "integer",
      },
    },
  },
});
console.log(response);
PUT /my-explicit-mappings-books
{
  "mappings": {
    "dynamic": false,  
    "properties": {  
      "name": { "type": "text" },
      "author": { "type": "text" },
      "release_date": { "type": "date", "format": "yyyy-MM-dd" },
      "page_count": { "type": "integer" }
    }
  }
}

Disables dynamic mapping for the index. Documents containing fields not defined in the mapping will be rejected.

The properties object defines the fields and their data types for documents in this index.
Example response 
{
  "acknowledged": true,
  "shards_acknowledged": true,
  "index": "my-explicit-mappings-books"
}

Combine dynamic and explicit mappings

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Explicit mappings are defined at index creation, and documents must conform to these mappings. You can also use the Update mapping API. When an index has the dynamic flag set to true, you can add new fields to documents without updating the mapping.

This allows you to combine explicit and dynamic mappings. Learn more about managing and updating mappings.

Step 4: Search your index

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Indexed documents are available for search in near real-time, using the _search API.

Search all documents

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Run the following command to search the books index for all documents:

resp = client.search(
    index="books",
)
print(resp)
response = client.search(
  index: 'books'
)
puts response
const response = await client.search({
  index: "books",
});
console.log(response);
GET books/_search
Example response 
{
  "took": 2, 
  "timed_out": false, 
  "_shards": { 
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": { 
    "total": { 
      "value": 7,
      "relation": "eq"
    },
    "max_score": 1, 
    "hits": [
      {
        "_index": "books", 
        "_id": "CwICQpIBO6vvGGiC_3Ls", 
        "_score": 1, 
        "_source": { 
          "name": "Brave New World",
          "author": "Aldous Huxley",
          "release_date": "1932-06-01",
          "page_count": 268
        }
      },
      ... (truncated)
    ]
  }
}

The took field indicates the time in milliseconds for Elasticsearch to execute the search

The timed_out field indicates whether the search timed out

The _shards field contains information about the number of shards that the search was executed on and the number that succeeded

The hits object contains the search results

The total object provides information about the total number of matching documents

The max_score field indicates the highest relevance score among all matching documents

The _index field indicates the index the document belongs to

The _id field is the document’s unique identifier

The _score field indicates the relevance score of the document

The _source field contains the original JSON object submitted during indexing

match query

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You can use the match query to search for documents that contain a specific value in a specific field. This is the standard query for full-text searches.

Run the following command to search the books index for documents containing brave in the name field:

resp = client.search(
    index="books",
    query={
        "match": {
            "name": "brave"
        }
    },
)
print(resp)
response = client.search(
  index: 'books',
  body: {
    query: {
      match: {
        name: 'brave'
      }
    }
  }
)
puts response
const response = await client.search({
  index: "books",
  query: {
    match: {
      name: "brave",
    },
  },
});
console.log(response);
GET books/_search
{
  "query": {
    "match": {
      "name": "brave"
    }
  }
}
Example response 
{
  "took": 9,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 1,
      "relation": "eq"
    },
    "max_score": 0.6931471, 
    "hits": [
      {
        "_index": "books",
        "_id": "CwICQpIBO6vvGGiC_3Ls",
        "_score": 0.6931471,
        "_source": {
          "name": "Brave New World",
          "author": "Aldous Huxley",
          "release_date": "1932-06-01",
          "page_count": 268
        }
      }
    ]
  }
}

The max_score is the score of the highest-scoring document in the results. In this case, there is only one matching document, so the max_score is the score of that document.

Step 5: Delete your indices (optional)

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When following along with examples, you might want to delete an index to start from scratch. You can delete indices using the Delete index API.

For example, run the following command to delete the indices created in this tutorial:

const response = await client.indices.delete({
  index: "books",
});
console.log(response);

const response1 = await client.indices.delete({
  index: "my-explicit-mappings-books",
});
console.log(response1);
DELETE /books
DELETE /my-explicit-mappings-books

Deleting an index permanently deletes its documents, shards, and metadata.

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