[BUG] Test DeletePitMultiNodeIT.testDeleteWhileSearch is flaky

[mch2]

REPRODUCE WITH: ./gradlew ':server:internalClusterTest' --tests "org.opensearch.search.pit.DeletePitMultiNodeIT.testDeleteWhileSearch" -Dtests.seed=CE842172B3367A4B -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=es-MX -Dtests.timezone=Europe/London -Druntime.java=20

from
Gradle Check (Jenkins) Run Completed with:
RESULT: UNSTABLE ❕
TEST FAILURES:
1 org.opensearch.search.pit.DeletePitMultiNodeIT.testDeleteWhileSearch
URL: https://build.ci.opensearch.org/job/gradle-check/21640/
CommitID: 7d26193
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[macohen]

Removed the search label and added indexing to direct this to the right place.

cc: @anasalkouz