In this chapter, we will explore special queries that can be used to search for relationships between Elasticsearch and geo location documents.
When we have a parent-child relationship (based on join field mapping), we can use special queries to query for a similar relationship. Elasticsearch doesn't provide SQL join, but it lets you search child/parent related documents; it makes it possible to retrieve child documents via parent selection or by matching parent documents and filtering it by its children. The way to create a parent-child relationship in to create a relationship in Elasticsearch is very powerful and can help resolve many common data relationship issues that are used to easily solve issues in traditional relational databases in Elasticsearch. These features, in my experience...