Initial elasticsearch instrumentation (#747)
Initial elasticsearch instrumentation (#747)

This commit adds auto-instrumentation for elasticsearch. The
instrumentation has been mostly ported over from OpenTracing
elasticsearch instrumentation.

Co-authored-by: Yusuke Tsutsumi <efb51cfa9daed06a8e6e4ff93a97daa94dcae41d@tsutsumi.io>
Co-authored-by: alrex <1e5a92690ae5061b029620512ac8ae33d4f3a3b3@lightstep.com>
open-telemetry/opentelemetry-python-contrib,open-telemetry/opentelemetry-python-contrib,open-telemetry/opentelemetry-python-contrib