logs(indexer)Clean up log format in head index progress messages (#31761)

updates the log entries in `core/filtermaps/indexer.go` to remove double
quotes around keys like "first block" and "last block", changing them to
`firstblock` and `lastblock`. This brings them in line with the general
logging style used across the codebase, where log keys are unquoted
single words.

For example, the log:
`  INFO [...] "first block"=..., "last block"=...`

Is now rendered as:
`  INFO [...] firstblock=..., lastblock=...`

This change improves readability and maintains consistency with logs
such as:
`  INFO [...] number=2 sealhash=... uncles=0 txs=0 ...`

No functional behavior is changed — this is purely a formatting cleanup
for better developer experience.

Author: MonkeyMarcel

core/filtermaps/indexer.go

@@ -254,7 +254,7 @@ func (f *FilterMaps) tryIndexHead() error {
 			((!f.loggedHeadIndex && time.Since(f.startedHeadIndexAt) > headLogDelay) ||
 				time.Since(f.lastLogHeadIndex) > logFrequency) {
 			log.Info("Log index head rendering in progress",
-				"first block", f.indexedRange.blocks.First(), "last block", f.indexedRange.blocks.Last(),
+				"firstblock", f.indexedRange.blocks.First(), "lastblock", f.indexedRange.blocks.Last(),
 				"processed", f.indexedRange.blocks.AfterLast()-f.ptrHeadIndex,
 				"remaining", f.indexedView.HeadNumber()-f.indexedRange.blocks.Last(),
 				"elapsed", common.PrettyDuration(time.Since(f.startedHeadIndexAt)))
@@ -266,7 +266,7 @@ func (f *FilterMaps) tryIndexHead() error {
 	}
 	if f.loggedHeadIndex && f.indexedRange.hasIndexedBlocks() {
 		log.Info("Log index head rendering finished",
-			"first block", f.indexedRange.blocks.First(), "last block", f.indexedRange.blocks.Last(),
+			"firstblock", f.indexedRange.blocks.First(), "lastblock", f.indexedRange.blocks.Last(),
 			"processed", f.indexedRange.blocks.AfterLast()-f.ptrHeadIndex,
 			"elapsed", common.PrettyDuration(time.Since(f.startedHeadIndexAt)))
 	}
@@ -323,7 +323,7 @@ func (f *FilterMaps) tryIndexTail() (bool, error) {
 			if f.indexedRange.hasIndexedBlocks() && f.ptrTailIndex >= f.indexedRange.blocks.First() &&
 				(!f.loggedTailIndex || time.Since(f.lastLogTailIndex) > logFrequency) {
 				log.Info("Log index tail rendering in progress",
-					"first block", f.indexedRange.blocks.First(), "last block", f.indexedRange.blocks.Last(),
+					"firstblock", f.indexedRange.blocks.First(), "last block", f.indexedRange.blocks.Last(),
 					"processed", f.ptrTailIndex-f.indexedRange.blocks.First()+tpb,
 					"remaining", remaining,
 					"next tail epoch percentage", f.indexedRange.tailPartialEpoch*100/f.mapsPerEpoch,
@@ -346,7 +346,7 @@ func (f *FilterMaps) tryIndexTail() (bool, error) {
 	}
 	if f.loggedTailIndex && f.indexedRange.hasIndexedBlocks() {
 		log.Info("Log index tail rendering finished",
-			"first block", f.indexedRange.blocks.First(), "last block", f.indexedRange.blocks.Last(),
+			"firstblock", f.indexedRange.blocks.First(), "lastblock", f.indexedRange.blocks.Last(),
 			"processed", f.ptrTailIndex-f.indexedRange.blocks.First(),
 			"elapsed", common.PrettyDuration(time.Since(f.startedTailIndexAt)))
 		f.loggedTailIndex = false