Recently，we upgrade our es cluster to 7.2.0 and find the same search took time is longer than 6.8.0
so we prepare for two cluster (7.2 and 6.8) with same index data set , same mapping, and execute same search. we found that 7.2.0 is slower than 6.8.0,
our tests below:
7.2.0 index list:
6.8.0 index list :
doc count is same across two clusters
profile the same search:
After reviewing these profile results, I find that 7.2.0 took more time on advance in query and collect in aggregation
Is the Lucene upgrade cause this performance drop?
review the aggregation profile section, some phase of 7.x is extremely slow:
hello, have you got the answer of this problem?
I've met the same problem, the same machine, the same index, different version of elasticsearch, 7.3.1 vs 6.2.4 ,when I search the logs on kibana with the same query request, It takes longer on 7.3.1 than 6.2.4.