Partial updates in Elasticsearch - Mini Project: Build & Apply

Partial updates in Elasticsearch

📖 Scenario: You are managing a collection of books in an Elasticsearch index. Sometimes, you need to update only certain fields of a book without replacing the entire document.

🎯 Goal: Learn how to perform partial updates on documents in Elasticsearch using the _update API.

📋 What You'll Learn

Create an index with a sample book document

Prepare the _update API call for document ID 1

Write a partial update script to change specific fields

Print the update response to verify success

💡 Why This Matters

🌍 Real World

Partial updates let you change only some parts of a document without sending the whole data again. This saves time and bandwidth.

💼 Career

Many jobs working with search engines or databases require updating records efficiently. Knowing partial updates in Elasticsearch is a valuable skill.

1

Create the initial book document

Create an index called library and add a document with ID 1 containing these fields: title as "The Great Gatsby", author as "F. Scott Fitzgerald", and year as 1925.

Elasticsearch

# Use the Elasticsearch index API to create the document
# Your code here

Need a hint?

Use the PUT method with the index name library and document ID 1.

2

Prepare the _update API call

Use the _update API endpoint for document ID 1 with an empty doc object.

Elasticsearch

PUT /library/_doc/1
{
  "title": "The Great Gatsby",
  "author": "F. Scott Fitzgerald",
  "year": 1925
}

# Write the _update API call for document ID 1
# Your code here

Need a hint?

Use the _update API with the document ID 1.

3

Write the partial update to change the year

Use the _update API on the library index and document ID 1 to change the year field to 1926 using the doc parameter.

Elasticsearch

PUT /library/_doc/1
{
  "title": "The Great Gatsby",
  "author": "F. Scott Fitzgerald",
  "year": 1925
}

# Update the year field to 1926
# Your code here

Need a hint?

Inside doc, specify the field year with the new value 1926.

4

Print the update response

Print the response from the update request to confirm the partial update was successful.

Elasticsearch

PUT /library/_doc/1
{
  "title": "The Great Gatsby",
  "author": "F. Scott Fitzgerald",
  "year": 1925
}

POST /library/_update/1
{
  "doc": {
    "year": 1926
  }
}

# Print the update response
# Your code here

Need a hint?

When you run the update command, Elasticsearch returns a JSON response showing "result": "updated" if successful.