[chore][exporter/elasticsearch] Re-enable exporter test on Windows (#… #22

Job	Run time
windows-unittest-matrix (receiver-0)	18m 26s
windows-unittest-matrix (receiver-1)	21m 7s
windows-unittest-matrix (receiver-2)	23m 5s
windows-unittest-matrix (receiver-3)	21m 5s
windows-unittest-matrix (processor-0)	15m 7s
windows-unittest-matrix (processor-1)	15m 56s
windows-unittest-matrix (exporter-0)	13m 35s
windows-unittest-matrix (exporter-1)	20m 23s
windows-unittest-matrix (exporter-2)	18m 42s
windows-unittest-matrix (exporter-3)	15m 9s
windows-unittest-matrix (extension)	15m 23s
windows-unittest-matrix (connector)	13m 24s
windows-unittest-matrix (internal)	16m 31s
windows-unittest-matrix (pkg)	16m 2s
windows-unittest-matrix (cmd-0)	9m 35s
windows-unittest-matrix (cmd-1)	14m 14s
windows-unittest-matrix (other)	26m 27s
windows-unittest	0s
	4h 54m 11s

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