How to Resolve TransportException: Missing [X-Elastic-Product] Header in Elasticsearch?

How can I resolve the TransportException: Missing [X-Elastic-Product] header while using Elasticsearch?

// Example of a valid request that includes the X-Elastic-Product header
HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("http://localhost:9200/_search"))
    .header("X-Elastic-Product", "Elasticsearch")
    .GET()
    .build();

The error `TransportException: Missing [X-Elastic-Product] header` in Elasticsearch indicates that your client is not sending the required header for identifying the product type. This header is crucial for ensuring compatibility and might arise when configuring your Elasticsearch clients improperly or using an incorrect version of the client library.

// Example of how to include the `X-Elastic-Product` header in a request:
HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("http://localhost:9200/_search"))
    .header("X-Elastic-Product", "Elasticsearch")
    .GET()
    .build();

Causes

• The Elasticsearch client is outdated or incompatible with the server version.
• The HTTP request to the Elasticsearch server is missing the required X-Elastic-Product header.
• The client is configured incorrectly and not properly adding headers.

Solutions

• Update your Elasticsearch client library to the latest version to ensure compatibility.
• Manually add the X-Elastic-Product header to your HTTP requests to the Elasticsearch server.
• Ensure that your client configuration includes necessary headers.

Mistake: Neglecting to update the client library when the Elasticsearch server is upgraded.

Solution: Regularly check for updates and maintain version compatibility between client and server.

Mistake: Forgetting to include custom headers in API requests.

Solution: Always include required headers like X-Elastic-Product in your API requests.