hi hettervi
thanks for your attention.
yes, in know it :). sourcetype is _json.
finally i solved it.
in setting -> source types -> _json, i added below setting.
-SHOULD_LINEMERGE= false
-AUTO_KV_JSON = false
-KV_MODE = none
and timestamp in auto mode and has a structure like this (Wed May 24 09:30:00.555 UTC 2017).
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