fix: do not retain span logger created with index set initialized at query time #14027
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What this PR does / why we need it:
While investigating the memory usage of index gateways, I came across an instance where the logger was doing too many allocations coming from specifically here. It turns out we were creating a span logger at query time and retaining it with the index set initialized at query time.
This PR fixes the issue by not using span logger while initializing index sets.