Note to self: check with clients team first

There is https://github.com/aspecto-io/opentelemetry-ext-js/tree/master/packages/instrumentation-elasticsearch as well if we wanted.

IIUC this PR adds OTEL instrumentation natively in elasticsearch client rigtht? If so we should add only instrumentation for elasticsearch's versions using a @elastic/transport 8.6.0 or below which is @elastic/elasticsearch <=8.15

We should add a test/isntr-elasticsearch.test.js to sanity check that it works. (I tried locally and it does not.) I got this trace:

------ trace 6ed383 (1 span) ------
       span 7ce6ce "tcp.connect" (7.8ms, SPAN_KIND_INTERNAL)
------ trace ee3359 (2 spans) ------
       span eb3d59 "GET" (3.0ms, STATUS_CODE_ERROR, SPAN_KIND_CLIENT, GET http://metadata.google.internal./computeMetadata/v1/instance)
  +0ms `- span b2ce11 "tcp.connect" (2.7ms, STATUS_CODE_ERROR, SPAN_KIND_INTERNAL)
------ trace ede1e1 (2 spans) ------
       span 52dbcc "GET" (3003.2ms, STATUS_CODE_ERROR, SPAN_KIND_CLIENT, GET http://169.254.169.254/computeMetadata/v1/instance)
  +0ms `- span 83b5f5 "tcp.connect" (3002.5ms, SPAN_KIND_INTERNAL)
------ trace d451bb (1 span) ------
       span f65260 "GET" (21.4ms, SPAN_KIND_CLIENT, GET http://localhost:9200/_search?q=pants -> 200)

using:

node -r @elastic/opentelemetry-node trace-elasticsearch8.js

@david-luna I could steal this one if you like.

I had a start at adding instr-elasticsearch.test.js locally.
I know why it isn't working yet: It is because @elastic/[email protected] is only part of the requirement for OTel native instr working. It also requires @elastic/[email protected], which includes a "meta" object with ES client request details passed down to @elastic/transport. That was added in https://github.com/elastic/elastic-client-generator-js/pull/42, but needs a new @elastic/elasticsearch release.

(Note to self: g eon3)

I had a start at adding instr-elasticsearch.test.js locally.

I have a draft PR to add a test here: #264
It is waiting on an es client 8.15.0 release first.

@trentm ill be happy to review your PR :)