Add ES info to error message when metadata fetching failed

[shuchenliu]

Provide more debugging information for issues like #91, when a valid ES connection does not return metadata as expected.

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
...etriever/data_tiers/tier_1/elasticsearch/driver.py	45.83% <ø> (ø)

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