[BUG] OpenSearch-Benchmark silently falls back and uses `default` for invalid index.codec values.

[mulugetam]

Describe the bug
OpenSearch-Benchmark silently falls back and uses default (LZ4) for an invalid index.codec value.

To Reproduce*
The below creates a geonames index and uses LZ4 instead of throwing an error.

opensearch-benchmark execute_test \
--workload=geonames \
--workload-params='{"index_settings":{"index.codec": "this_should_be_invalid"}}' \
--target-hosts=127.0.0.1:9200 \
--kill-running-processes \
--pipeline=benchmark-only \
--include-tasks=delete-index,create-index,index-append \
--kill-running-processes

Expected behavior
An error must be reported. E.g. invalid index.codec value 'this_should_be_invalid'.

[IanHoang]

Will take a look

[IanHoang]

Made some changes and tested it locally. Made a PR

$ opensearch-benchmark execute-test \
--pipeline=benchmark-only \
 --workload=geonames \
--target-host="<TARGET_ENDPOINT>" \
--client-options="basic_auth_user:'<USERNAME>',basic_auth_password:'<PASSWORD>'" \
 --include-tasks=delete-index,create-index,index-append \
--workload-params='{"index_settings":{"index.codec": "this_should_be_invalid"}}' \

   ____                  _____                      __       ____                  __                         __
  / __ \____  ___  ____ / ___/___  ____ ___________/ /_     / __ )___  ____  _____/ /_  ____ ___  ____ ______/ /__
 / / / / __ \/ _ \/ __ \\__ \/ _ \/ __ `/ ___/ ___/ __ \   / __  / _ \/ __ \/ ___/ __ \/ __ `__ \/ __ `/ ___/ //_/
/ /_/ / /_/ /  __/ / / /__/ /  __/ /_/ / /  / /__/ / / /  / /_/ /  __/ / / / /__/ / / / / / / / / /_/ / /  / ,<
\____/ .___/\___/_/ /_/____/\___/\__,_/_/   \___/_/ /_/  /_____/\___/_/ /_/\___/_/ /_/_/ /_/ /_/\__,_/_/  /_/|_|
    /_/

[INFO] You did not provide an explicit timeout in the client options. Assuming default of 10 seconds.

[ERROR] Cannot execute-test. Error in workload preparator (Invalid index.codec value 'this_should_be_invalid')

Getting further help:
*********************
* Check the log files in /Users/hoangia/.benchmark/logs for errors.
* Read the documentation at https://opensearch.org/docs.
* Ask a question on the forum at https://forum.opensearch.org/.
* Raise an issue at https://github.com/opensearch-project/OpenSearch-Benchmark/issues and include the log files in /Users/hoangia/.benchmark/logs.

-------------------------------
[INFO] FAILURE (took 8 seconds)
-------------------------------

[IanHoang]

Resolved in #296

[mulugetam]

@IanHoang OpenSearch since version 2.7.0 supports ZSTD and ZSTDNODICT compression codecs using Lucene's NamedSPILoader and this fix doesn't seem to address that. Could you please add ZSTD and ZSTDNODICT as additional valid values for index.codec?

Also, can you make the comparison case-insensitive? (The upcoming OpenSearch release would use zstd and zstdnodict instead of ZSTD and ZSTDNODICT)?