Elasticsearch: Set connection ttl

[vadimalekseev]

Fixes #513

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (dd11cd0) 67.74% compared to head (d7b91a6) 67.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #514      +/-   ##
==========================================
- Coverage   67.74%   67.67%   -0.08%     
==========================================
  Files         104      104              
  Lines       10689    10690       +1     
==========================================
- Hits         7241     7234       -7     
- Misses       2980     2987       +7     
- Partials      468      469       +1     

Files	Coverage Δ
pipeline/pipeline.go	61.12% <100.00%> (-1.63%)	⬇️
plugin/output/elasticsearch/elasticsearch.go	47.05% <100.00%> (+0.28%)	⬆️

... and 3 files with indirect coverage changes

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