Bulk update The segment is too much ES5.4 version

Scenario is this: bulk update5000 data, have been running (per batch of 5000 continuously updated data)
Found that segment produce dozens of hundreds of 10 KB per second (assuming I 10 MB per batch data, should not produce a few 2 MB segment?),
Each batch bulk update dozens of seconds, even hundreds of seconds, too slow, I am not high concurrency of the single thread to run
The following figure
Environmental 8-core CPU 32 gb of memory hard disk 300 g, three machines,
160 million document, a total of 60 g harddisk

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