Upgrade nmslib to 2.0.11

[jmazanec15]

Issue #, if available:

290

Description of changes: PR upgrades nmslib from 2.0.8 to 2.0.11. 2.0.8 was deleted because of build failure for python bindings. Core code was not changed between update from 2.0.8 to 2.0.11.

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[codecov[bot]]

Codecov Report

Merging #302 (4b5a316) into master (79f7748) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #302   +/-   ##
=========================================
  Coverage     80.51%   80.51%           
- Complexity      388      389    +1     
=========================================
  Files            62       62           
  Lines          1468     1468           
  Branches        130      130           
=========================================
  Hits           1182     1182           
  Misses          239      239           
  Partials         47       47           

Impacted Files	Coverage Δ	Complexity Δ
...istroforelasticsearch/knn/index/KNNIndexCache.java	92.30% <ø> (ø)	35.00 <0.00> (ø)
...istroforelasticsearch/knn/index/KNNIndexShard.java	92.00% <ø> (ø)	10.00 <0.00> (ø)
...pendistroforelasticsearch/knn/index/KNNWeight.java	97.14% <ø> (ø)	10.00 <0.00> (ø)
...index/codec/KNN80Codec/KNN80DocValuesConsumer.java	70.88% <ø> (ø)	15.00 <0.00> (ø)
...forelasticsearch/knn/index/util/NmsLibVersion.java	100.00% <100.00%> (ø)	2.00 <0.00> (ø)
...stroforelasticsearch/knn/index/v2011/KNNIndex.java	76.74% <100.00%> (ø)	8.00 <1.00> (?)

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