[Bug] Flaky test org.opensearch.geospatial.search.aggregations.bucket.geogrid.GeoHexAggregationIT

[naveentatikonda]

Test was flaky and was failing in 2.17 distribution build
https://ci.opensearch.org/ci/dbc/integ-test/2.17.0/10292/linux/x64/rpm/test-results/8678/integ-test/geospatial/with-security/stdout.txt

#672 (comment)

org.opensearch.geospatial.search.aggregations.bucket.geogrid.GeoHexAggregationIT > testGeoHexGridBucket FAILED
    java.lang.IllegalStateException: Duplicate key POINT (-180.0 -90.0) (attempted merging values 8bf29380e0d0fff and 8bf29380e0d0fff)
        at __randomizedtesting.SeedInfo.seed([51F5FA3FF149479C:932892FFEC68EB34]:0)
        at java.base/java.util.stream.Collectors.duplicateKeyException(Collectors.java:135)
        at java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:182)
        at java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
        at java.base/java.util.stream.IntPipeline$1$1.accept(IntPipeline.java:180)
        at java.base/java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:104)
        at java.base/java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:712)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
        at org.opensearch.geospatial.search.aggregations.bucket.geogrid.GeoHexAggregationIT.generateRandomPointH3CellMap(GeoHexAggregationIT.java:173)
        at org.opensearch.geospatial.search.aggregations.bucket.geogrid.GeoHexAggregationIT.testGeoHexGridBucket(GeoHexAggregationIT.java:67)