Elasticsearch migration from 2.6 to 5.6

[jphilou]

Upgrade Elasticsearch from 2.6 to 5.6

• Mapping Update (scripts and code)
• Code update for deprecation update (fields, missings, ...)
• Component update (elasticsearch, elasticsearch DSL)
• Migration scripts and logstash engine / pipeline
• CI scripts
• ES 5.6
• Logstash 5.6
• elastic plugin

please README: ./scripts/README.md

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00%	✅ 95.83%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (68b8522)	19866	18418	92.71%
Head commit (f6105fd)	19866 (+0)	18418 (+0)	92.71% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1805)	24	23	95.83%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{Codacy will stop sending the deprecated coverage status from June 5th, 2024. Learn more}