Elasticsearch unassigned shards: How to resolve

Here's a concise summary of the article "Cómo solucionar cinco problemas de rendimiento y escalado de Elasticsearch" (How to solve five performance and scaling problems in Elasticsearch):

The article details common Elasticsearch performance bottlenecks and how to address them. It focuses on issues like inefficient queries (using profiling), inadequate hardware (CPU, memory, disk), incorrect indexing mapping, improper shard configuration, and slow search speeds due to caching problems. By optimizing these areas – query design, infrastructure, and configuration – users can significantly improve Elasticsearch's performance and scalability.