Opensearch - Fix incorrect java options env variable

[ihor-sviziev]

I had an issue when opensearch container was stopping with message like this for some reason:

2024-01-11 19:16:21 ./opensearch-docker-entrypoint.sh: line 70:   108 Killed                  "$@" "${opensearch_opts[@]}"

or

2024-01-11 19:18:47 ./opensearch-docker-entrypoint.sh: line 70:    34 Killed                  "$@" "${opensearch_opts[@]}"

I looked what could potentially cause such issue and found that opensearch should actually have a different env variable for configuring memory params in JVM, not ES_JAVA_OPTS (from ElasticSearch), but OPENSEARCH_JAVA_OPTS:
https://opensearch.org/docs/1.0/opensearch/install/important-settings/

After fixing path, looks like the opensearch works fine

[ihor-sviziev]

@navarr pls review