When routing does matter
In this section, we will discuss one of the most powerful control mechanisms that we have in our hands—routing. To be concise, it allows us to choose a shard that will be used to index or search data. It doesn't sound interesting, right? So, before continuing with some use cases I'll try to show you how the standard, distributed search and indexing works in ElasticSearch.
How does indexing work?
During an index operation, when you send a document for indexing, ElasticSearch looks at its identifier to choose the shard in which the document should be indexed. By default, ElasticSearch calculates the hash value of the document's identifier and on the basis of that, puts the document in one of the available primary shards. Then ...
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