Introducing cross-project search for Elastic Cloud Serverless

Introduces cross-project search (CPS) for Elastic Cloud Serverless, enabling unified querying across distributed projects without data movement or egress fees. Details include one-step linking via the cloud console, flexible scoping controls (UI scope, per-space defaults, query adjustments), and security enforcement per project. Demonstrates how to link projects and manage search scope using the project picker and project_routing expressions in ES|QL. Highlights enhanced Elastic Cloud API Keys for direct authentication against Elasticsearch and Kibana APIs, simplifying programmatic access. Outlines pricing and availability for CPS, including linked retained data charges and data transfer fees.