ESQL: Fix test error (elastic#143537)

In elastic#133479 I wrote a test for tagged queries. That test had an error one
in 10,000 times where it chose 0 matching documents. Ooops. This makes
sure we always produce a matching document.

Closes elastic#143020

Author: nik9000

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/OperatorTests.java

@@ -369,9 +369,9 @@ public void testHashLookup() {
     }
 
     public void testPushRoundToCountToQuery() throws IOException {
-        int firstGroupDocs = randomIntBetween(0, 10_000);
-        int secondGroupDocs = randomIntBetween(0, 10_000);
-        int thirdGroupDocs = randomIntBetween(0, 10_000);
+        int firstGroupDocs = randomIntBetween(1, 10_000);
+        int secondGroupDocs = randomIntBetween(1, 10_000);
+        int thirdGroupDocs = randomIntBetween(1, 10_000);
 
         CheckedConsumer<DirectoryReader, IOException> verifier = reader -> {
             Query firstGroupQuery = LongPoint.newRangeQuery("g", Long.MIN_VALUE, 99);