Update elasticsearch requirement from >= 5.0, < 6.2 to >= 5.0, < 7.1

[dependabot-preview]

Updates the requirements on elasticsearch to permit the latest version.

Release notes

Sourced from elasticsearch's releases.

7.0.0

This release supports version 7.0 of the Elasticsearch server. There have been no notable updates since the 7.0.0.pre release. Please see the release notes for that version.

Changelog

Sourced from elasticsearch's changelog.

7.0.0.pre

• Added elastic_ruby_console executable

Client

• Fixed failing integration test
• Updated the Manticore development dependency
• Fixed a failing Manticore unit test
• Removed "turn" and switched the tests to Minitest
• Fixed integration tests for Patron
• Allow passing request headers in perform_request
• Added integration test for passing request headers in perform_request
• Added, that request headers are printed in trace output, if set
• Fix typos in elasticsearch-transport/README.md
• Assert that connection count is at least previous count when reloaded
• Adjust test for change in default number of shards on ES 7
• Abstract logging functionality into a Loggable Module (#556)
• Convert client integration tests to rspec
• Add flexible configuration in spec helper
• Use helper methods in spec_helper
• Remove minitest client integration tests in favor of rspec test
• Convert tests to rspec and refactor client
• minor changes to the client specs
• Use pry-nav in development for JRuby
• Keep arguments variable name for now
• Skip round-robin test for now
• Mark test as pending until there is a better way to detect rotating nodes
• Remove client unit test in favor of rspec test
• Comment-out round-robin test as it occasionally passes and pending is ineffective
• Document the default host and port constant
• Add documentation to spec_helper methods
• Redacted password if host info is printed in error message
• Adds tests for not including password in logged error message
• The redacted string change will be in 6.1.1
• Add more tests for different ways to specify client host argument
• Do not duplicate connections in connection pool after rebuild (#591)
• Ensure that the spec rake task is run as part of integration tests
• Use constant to define Elasticsearch hosts and avoid yellow status when number of nodes is 1
• Update handling of publish_address in _nodes/http response
• Add another test for hostname/ipv6:port format

API

• Added the wait_for_active_shards parameter to the "Indices Open" API
• Added the "Indices Split" API
• Added the wait_for_no_initializing_shards argument to the "Cluster Health" API
• Added the "Cluster Remote Info" API
• Remove the dependency on "turn"
• Clear cluster transient settings in test setups

... (truncated)

Commits

• 362cae9 Release 7.0.0
• 31ff75a Disable benchmarking for now until shared results instance is set up
• e6e9a55 Fix spelling of statistics in benchmarking document
• 1535d1a [BENCHMARKING] Use Benchmark.realtime to capture total duration
• 7f0df06 [BENCHMARKING] Use Benchmark.realtime to capture total duration
• 7f00039 [BENCHMARKING] Generate index names outside benchmarked block
• 8d18693 Release 7.0.0.pre
• dbd5863 Extract details of time measurement to common method
• e350557 Move start so that it is taken once before measurements start
• 422244e Use monotonic time to avoid time issues while benchmarking
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #11.