Fix merge policy to restrict to OS 2.11+ in Big5 workload (#247)

Signed-off-by: Ian Hoang <hoangia@amazon.com>
Co-authored-by: Ian Hoang <hoangia@amazon.com>
(cherry picked from commit dfe0395)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

big5/index.json

@@ -10,7 +10,7 @@
     "index.number_of_replicas": {{number_of_replicas | default(1)}},
     "index.queries.cache.enabled": {{query_cache_enabled | default(false) | tojson}},
     "index.requests.cache.enable": {{requests_cache_enabled | default(false) | tojson}},
-    {% if distribution_version is not defined or distribution_version < 6.0 %}
+    {% if ( (distribution_version is not defined) or (distribution_version > 2.11 and distribution_version < 6.0) ) %}
       "index.merge.policy": "{{index_merge_policy | default('log_byte_size') }}",
     {% endif %}
     "index.codec": "best_compression",