feat: more configuration options for Elasticsearch/OpenSearch

[StijnCaerts]

Related Issue(s):

• Please enable http_compress by default #348

Description:
Allow to configure multiple Elasticsearch/OpenSearch hosts (comma-separated) and enable http_compress by default.

PR Checklist:

• Code is formatted and linted (run pre-commit run --all-files)
• Tests pass (run make test)
• Documentation has been updated to reflect changes, if applicable
• Changes are added to the changelog

[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

stac_fastapi/opensearch/stac_fastapi/opensearch/config.py:20

• Consider providing a default value or null-check for 'ES_HOST' to avoid errors if the environment variable is not set.

for host in os.getenv("ES_HOST").split(",")

stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py:21

• Consider providing a default value or null-check for 'ES_HOST' to avoid errors if the environment variable is not set.

for host in os.getenv("ES_HOST").split(",")

[jonhealy1]

Looks really good. Thanks @StijnCaerts