Revert "core: ensure txindex will be triggered at least once (ethereu…

…m#27847)"

This reverts commit 01eb95a.

core/blockchain.go

@@ -2421,12 +2421,6 @@ func (bc *BlockChain) skipBlock(err error, it *insertIterator) bool {
 func (bc *BlockChain) indexBlocks(tail *uint64, head uint64, done chan struct{}) {
 	defer func() { close(done) }()
 
-	// If head is 0, it means the chain is just initialized and no blocks are inserted,
-	// so don't need to indexing anything.
-	if head == 0 {
-		return
-	}
-
 	// The tail flag is not existent, it means the node is just initialized
 	// and all blocks(may from ancient store) are not indexed yet.
 	if tail == nil {
@@ -2486,14 +2480,6 @@ func (bc *BlockChain) maintainTxIndex() {
 	defer sub.Unsubscribe()
 	log.Info("Initialized transaction indexer", "limit", bc.TxLookupLimit())
 
-	// Launch the initial processing if chain is not empty. This step is
-	// useful in these scenarios that chain has no progress and indexer
-	// is never triggered.
-	if head := rawdb.ReadHeadBlock(bc.db); head != nil {
-		done = make(chan struct{})
-		go bc.indexBlocks(rawdb.ReadTxIndexTail(bc.db), head.NumberU64(), done)
-	}
-
 	for {
 		select {
 		case head := <-headCh: