Updated elasticsearch from 6.8 to 7.1, updated project dependencies

[5hirish]

Description

Major version upgrade for elasticsearch 6.8 to 7.1. Breaking Changes: https://www.elastic.co/guide/en/elasticsearch/reference/7.x/breaking-changes-7.0.html IMP: types are now deprecated in elasticsearch indexes.

Types of change

Dependency upgrade.

Checklist

• [x] I ran the tests, and all new and existing tests passed.
• [x] My changes don't require a change to the documentation, or if they do, I've added all required information.
• [ ] My changes requires the reindexing of the current indexes.

[codecov[bot]]

Codecov Report

Merging #44 into master will decrease coverage by 0.04%. The diff coverage is 46.15%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   38.71%   38.67%   -0.05%     
==========================================
  Files          27       27              
  Lines        1436     1435       -1     
  Branches      191      191              
==========================================
- Hits          556      555       -1     
  Misses        851      851              
  Partials       29       29

Impacted Files	Coverage Δ
qas/esstore/es_config.py	100% <ø> (ø)	:arrow_up:
qas/classifier/question_classifier.py	83.83% <100%> (ø)	:arrow_up:
qas/esstore/es_connect.py	48.05% <25%> (ø)	:arrow_up:
qas/esstore/es_operate.py	36.11% <50%> (ø)	:arrow_up:

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