Disable txn indexer in stateless mode

Since stateless nodes are using a different pruner from the regular pruner in geth, the transaction indexer will have problem with pruned blocks, resulting hanging goroutines in memory. This change prevents stateless node from running indexer on pruned blocks.

Author: cffls

core/blockchain.go

@@ -621,7 +621,8 @@ func NewBlockChain(db ethdb.Database, genesis *Genesis, engine consensus.Engine,
 	}
 
 	// Start tx indexer if it's enabled.
-	if bc.cfg.TxLookupLimit >= 0 {
+	// Disable tx indexer in stateless mode to avoid potential issues with pruning in stateless mode.
+	if bc.cfg.TxLookupLimit >= 0 && !bc.cfg.Stateless {
 		bc.txIndexer = newTxIndexer(uint64(bc.cfg.TxLookupLimit), bc)
 	}