class field can be replaced by local variable

[noobyu6]

What this PR does / why we need it:
class fields can be replaced by local variables which can save memory
Which issue(s) this PR closes:

• Closes Feature Request/Idea:Code optimization suggestions #8771

Special notes for your reviewer:
no
Suggestions on how to test this:
code review
Does this PR introduce a user interface change? If mockups are available, please link/include them here:
no
Is there a release notes update needed for this change?:
reduce memory usage
Additional documentation:

[coveralls]

Coverage increased (+0.008%) to 19.718% when pulling 68be767 on noobyu6:master into 21ac7e1 on IQSS:master.

[scolapasta]

Hi @noobyu6 , for this next sprint we are catching up on Community PRs. Would you mind updating/ refreshing thiis PR from develop? Thanks!

[pdurbin]

All the SWORD tests are passing: https://jenkins.dataverse.org/job/IQSS-Dataverse-Develop-PR/job/PR-8809/1/testReport/edu.harvard.iq.dataverse.api/SwordIT/

I'm approving this. Off to QA. Thanks, @noobyu6!

[pdurbin]

As discussed at standup, we're comfortable with the same person doing review and QA. I'm merging this. Again, it's a trivial change and the SWORD API tests pass.

[pdurbin]

@noobyu6 I'm very sorry but I merged this pull request without noticing that it was targeting the "master" branch rather than the "develop" branch. Can you please create a new pull request that targets the "develop" branch? Thanks.

[noobyu6]

I see the same situation exists in the master branch, so merging into the master branch is also ok

[pdurbin]

@noobyu6 no. I reverted the master branch (see #8967). It comes down to our process. All PRs are merged into develop. Then at release time we merge develop into master. So please make a new PR against develop if you want this change. Sorry for the inconvenience.

[noobyu6]

@pdurbin I have made a new PR (see #8970).