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GH-40775: [Benchmarking][Java] Fix conbench timeout (#40786)

### Rationale for this change

The java build script has been recently updated and it is affecting conbench, which is now seeing timeouts when building java. The logs are producing 100s of GB of data due to an unnecessary debug log msg.

### What changes are included in this PR?

* Delete log message on write to memory

### Are these changes tested?

Yes, via conbench

### Are there any user-facing changes?

No
* GitHub Issue: #40775

Authored-by: Dane Pitkin <dane@voltrondata.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>