Ingest nodes
As we learnt in the previous section, ingest nodes help to preprocess things before a document is indexed. Before a bulk request or index operations, the ingest node intercepts the request and does required processing on the document. An example of such a processor can be the date processor, which is used to parse the dates in fields. Another example is a convert processor, which converts a field value to a target type, for example, string to integer. A number of processors are available at: https://www.elastic.co/guide/en/elasticsearch/reference/5.1/ingest-processors.html.
These kinds of nodes are helpful when a huge processing happens and we do not want a data node or master node to engage in processing. Dedicated ingest nodes can ...
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