Hurrah! We have completed looking at one of the most important features in Elasticsearch. We've learned about how to perform aggregations with well-designed examples, and delved into most of the types of aggregations. We've also learned how to use IEX ETF historical data to plot a graph of different types of moving averages, including forecasted data supported by the model.

In the next chapter, we will talk about the ingest node, in which documents can be pre-processed before the actual indexing takes place. We can define a pipeline to specify a series of processors to execute in the same order as they are declared. The ingest node intercepts bulk and index requests, applies the transformation, and then passes the documents back. By default, all nodes are enabled and we can disable the functionality of the node in the configuration file.