fix(elasticsearch): Make bulk size the same for testnet and mainnet

[oxarbitrage]

Motivation

The bulk size for testnet is greater than mainnet which should synchronize the chain faster, however Elasticsearch has a limit of 100M per bulk. A stream of big blocks in the testnet can crash the node.

Close #7270

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Solution

Make the testnet bulk size equal to the mainnet. This is 24 blocks per bulk.

Testing

I manually tested running the testnet, it syncing and adding records to the database as expected.

Review

Anyone can review.

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[teor2345]

Thanks!