Add ability to enable gzip compression in elasticsearch output

[tuannh99]

This adds ability to enable gzip compression in elasticsearch output.

Default is disable.

• PUT /_template/telegraf before this PR

https://prnt.sc/107gocy

• POST /_bulk before this PR

https://prnt.sc/107gpad

• PUT /_template/telegraf with gzip enabled

https://prnt.sc/107gmfu

• POST /_bulk with gzip enabled

https://prnt.sc/107gnox

Required for all PRs:

• Associated README.md updated.
• Has appropriate unit tests.

[telegraf-tiger]

🤝 ✅ CLA has been signed. Thank you!

[srebhan]

The code looks good with one exception. Please do not modify the existing test but rather add a new one that tests gzip-compression! Both setups should be tested!

[srebhan]

Looks good to me.

[sspaink]

@tuannh99 there were some linter errors found, would you mind resolving them? Thanks!

[srebhan]

@tuannh99 any news here?

[telegraf-tiger]

Looks like new artifacts were built from this PR. Get them here!

Artifact URLs

• windows_amd64.zip

• windows_i386.zip

• darwin_amd64.tar.gz

• armel.rpm

• linux_armel.tar.gz

• armel.deb

• static_linux_amd64.tar.gz

• ppc64le.rpm

• linux_ppc64le.tar.gz

• ppc64el.deb

• s390x.rpm

• linux_s390x.tar.gz

• s390x.deb

• armv6hl.rpm

• freebsd_armv7.tar.gz

• linux_armhf.tar.gz

• armhf.deb

• i386.rpm

• freebsd_i386.tar.gz

• linux_i386.tar.gz

• i386.deb

• aarch64.rpm

• linux_arm64.tar.gz

• arm64.deb

• x86_64.rpm

• freebsd_amd64.tar.gz

• linux_amd64.tar.gz

• amd64.deb

• linux_mipsel.tar.gz

• mipsel.deb

• linux_mips.tar.gz

• mips.deb

[tuannh99]

@srebhan I've fixed the linter. Tested changes using golangci-lint locally, it should be expressed in CI result soon.
Messed up the branch while rebasing and resolving conflicts so I had to clean it up and force push.

[telegraf-tiger]

Looks like new artifacts were built from this PR. Get them here!

Artifact URLs

• darwin_amd64.tar.gz

• windows_amd64.zip

• windows_i386.zip

• s390x.rpm

• linux_s390x.tar.gz

• s390x.deb

• armv6hl.rpm

• freebsd_armv7.tar.gz

• linux_armhf.tar.gz

• armhf.deb

• static_linux_amd64.tar.gz

• linux_mips.tar.gz

• mips.deb

• armel.rpm

• linux_armel.tar.gz

• armel.deb

• i386.rpm

• freebsd_i386.tar.gz

• linux_i386.tar.gz

• i386.deb

• linux_mipsel.tar.gz

• mipsel.deb

• x86_64.rpm

• freebsd_amd64.tar.gz

• linux_amd64.tar.gz

• amd64.deb

• ppc64le.rpm

• linux_ppc64le.tar.gz

• ppc64el.deb

• aarch64.rpm

• linux_arm64.tar.gz

• arm64.deb

[telegraf-tiger]

Looks like new artifacts were built from this PR. Get them here!

Artifact URLs

• windows_amd64.zip

• windows_i386.zip

• darwin_amd64.tar.gz

• armv6hl.rpm

• freebsd_armv7.tar.gz

• linux_armhf.tar.gz

• armhf.deb

• linux_mipsel.tar.gz

• mipsel.deb

• armel.rpm

• linux_armel.tar.gz

• armel.deb

• static_linux_amd64.tar.gz

• x86_64.rpm

• freebsd_amd64.tar.gz

• linux_amd64.tar.gz

• amd64.deb

• i386.rpm

• freebsd_i386.tar.gz

• linux_i386.tar.gz

• i386.deb

• aarch64.rpm

• linux_arm64.tar.gz

• arm64.deb

• s390x.rpm

• linux_s390x.tar.gz

• s390x.deb

• linux_mips.tar.gz

• mips.deb

• ppc64le.rpm

• linux_ppc64le.tar.gz

• ppc64el.deb

[reimda]

Looks good, thanks!