I meet several questions when using elasticsearch as below

hello:
I meet several questions when using elasticsearch as below:
1,I display it by Kinana, in the beginning, it is simultaneous, but the
delay becomes more and more serious when time past. I also tried to
optimize the data, but it didn't work.
2, Data abnormal, when operation, I found the data volume boost to double
and even more at the peaking second. But the log memory was not so huge
3, Currently, the quantity is 5,000 pcs each second, I want to know the
capacity of elasticserch, how many pieces can it afford ? Is there any
standard for reference ?
4, Do you have Chinese email service ?

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