Chapter 7: Aggregations
In developing search solutions, not only are the results important, but they also help us to improve the quality and the search focus. Elasticsearch provides a powerful tool to achieve these goals: aggregations. The main usage of aggregations is to provide additional data to the search results to improve their quality or to augment them with additional information.
For example, in a search for news articles, some facets that could be interesting to calculate could be the authors who wrote the articles and the date histogram of the publishing date; thus, aggregations are used, not only to improve the results' focus, but also to provide insight into stored data (analytics). This is the way that a lot of tools such as
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