How to understand index and search info obtained by _node/stats API?

use this API can get the index_total and query_total

GET _nodes/stats/indices/indexing,search

and from granfana can get info as below:

how to understand the meaning of index_total and query_total


on top of my head that is the total number of index operations and the total number of query operations. Probably you did a reindex at the first spike?


What is the meaning of numbers 150kb?A document counts once ?
and What is the meaning of number of query operations ,Is it a shard level?

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