fix coverage issue

[vamshin]

Issue #, if available:
#127

Description of changes:
Fix code coverage

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[jmazanec15]

Why does jnilib a part of this change? Also, what is code coverage before/after making this change?

[vamshin]

Why does jnilib a part of this change? Also, what is code coverage before/after making this change?

Latest jnilib library build using./gradew build on my mac is different than one in master. We could possibly avoid shipping these libraries as we now have ./gradlew build taking care of building it.

Previously it was around 62% code coverage with fix its 82%.

Detailed current Coverage :-

Element	Missed Instructions	Cov.	Missed Branches	Cov.	Missed	Cxty	Missed	Lines	Missed	Methods	Missed	Classes
com.amazon.opendistroforelasticsearch.knn.index		80%		66%	67	233	95	547	22	148	1	21
com.amazon.opendistroforelasticsearch.knn.index.codec.KNN80Codec		82%		70%	24	69	30	149	11	47	0	9
com.amazon.opendistroforelasticsearch.knn.plugin.transport		68%		100%	16	42	39	101	16	34	0	6
com.amazon.opendistroforelasticsearch.knn.plugin.stats		90%		50%	5	25	8	79	3	21	0	5
com.amazon.opendistroforelasticsearch.knn.index.v1736		86%		58%	5	17	6	43	0	11	0	3
com.amazon.opendistroforelasticsearch.knn.plugin.rest		88%		88%	3	16	3	33	1	7	0	1
com.amazon.opendistroforelasticsearch.knn.plugin		91%		75%	1	15	1	32	0	13	0	3
com.amazon.opendistroforelasticsearch.knn.index.codec		86%		66%	3	9	4	25	1	6	0	3
com.amazon.opendistroforelasticsearch.knn.index.codec.KNN84Codec		90%		100%	2	16	2	20	2	15	0	2
com.amazon.opendistroforelasticsearch.knn.index.util		91%		n/a	1	5	1	8	1	5	1	3
com.amazon.opendistroforelasticsearch.knn.plugin.stats.suppliers		100%		n/a	0	8	0	14	0	8	0	4
Total	929 of 5,273	82%	84 of 280	70%	127	455	189	1,051	57	315	2	60

[jmazanec15]

LGTM! Thanks