[skip changelog] Fix core search command tests

[silvanocerza]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce?

Fixes some tests failing.

• What is the current behavior?

core search tests are sometimes failing.

• What is the new behavior?

Tests should not failing anymore.

• Does this PR introduce a breaking change?

No.

• Other information:

None.

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