Tutorial by Topics: indices

It's easy to see types like a table in an SQL database, where the index is the SQL database. However, that is not a good way to approach types. All About Types In fact, types are literally just a metadata field added to each document by Elasticsearch: _type. The examples above created two type...

The key and indices of a data.table allow certain computations to run faster, mostly related to joins and subsetting. The key describes the table's current sort order; while each index stores information about the order of the table with respect a sequence of columns. See the "Remarks&quo...