I am going through the documentation to better understand the role of coordinating node, the different phases of search request -
I come across a phase -
Each shard returns just enough information to the coordinating node
What sort of information this phrase refers - "just enough information" ?
If we had complex queries like bool queries, aggregation - I presume coordinating need to execute the same query again to aggregation the results globally, in that case, coordinate node will also have some come kind of lucene engine running to aggregate the results ?