Exclude full-text search-filter operator tests on the analytics-engine route (#5527)

The 7 comparison-operator tests in OperatorIT / CalciteOperatorIT use the search-filter
syntax (source=idx age = 32), which lowers to a Lucene query_string predicate. Executing
it on the analytics-engine route fails with a null LuceneReader: query_string needs an
inverted-index searcher, which parquet-backed analytics indices don't have (DataFusion is
not a full-text engine). Full-text search is genuinely unsupported there.

Exclude these tests only when the analytics route is actually enabled
(Boolean.parseBoolean(tests.analytics.parquet_indices), matching
AnalyticsIndexConfig.isEnabled) so the v2 path still runs them, following the established
build.gradle exclusion pattern.

Signed-off-by: Kai Huang <ahkcs@amazon.com>

Author: ahkcs

integ-test/build.gradle

@@ -1035,13 +1035,30 @@ task integTestRemote(type: RestIntegTestTask) {
         systemProperty 'tests.analytics.parquet_indices', System.getProperty("tests.analytics.parquet_indices")
     }
 
+    // True only when the analytics-engine route is active (every test index parquet-backed). Matches
+    // AnalyticsIndexConfig.isEnabled, which parses the value rather than checking mere presence, so a
+    // `-Dtests.analytics.parquet_indices=false` run stays on the v2 path.
+    def analyticsEnabled = Boolean.parseBoolean(System.getProperty("tests.analytics.parquet_indices", "false"))
+
     // Set default query size limit
     systemProperty 'defaultQuerySizeLimit', '10000'
 
-    if (System.getProperty("tests.rest.bwcsuite") == null) {
-        filter {
+    filter {
+        if (System.getProperty("tests.rest.bwcsuite") == null) {
             excludeTestsMatching "org.opensearch.sql.bwc.*IT"
         }
+
+        if (analyticsEnabled) {
+            // Full-text search (search-filter syntax -> Lucene query_string) needs an inverted-index
+            // reader that parquet-backed analytics indices lack, so it's unsupported on this route.
+            excludeTestsMatching '*OperatorIT.testEqualOperator'
+            excludeTestsMatching '*OperatorIT.testNotEqualOperator'
+            excludeTestsMatching '*OperatorIT.testLessOperator'
+            excludeTestsMatching '*OperatorIT.testLteOperator'
+            excludeTestsMatching '*OperatorIT.testGreaterOperator'
+            excludeTestsMatching '*OperatorIT.testGteOperator'
+            excludeTestsMatching '*OperatorIT.testNotOperator'
+        }
     }
 
     // Exclude the same tests that are excluded for integTest