DOC-4670 Copy HFE known limitation to RS 7.8.x release notes

Author: rrelledge

content/operate/rs/release-notes/rs-7-8-releases/_index.md

@@ -246,3 +246,7 @@ The following legacy UI features are not yet available in the new Cluster Manage
 #### RedisGraph prevents upgrade to RHEL 9 
 
 You cannot upgrade from a prior RHEL version to RHEL 9 if the Redis Software cluster contains a RedisGraph module, even if unused by any database. The [RedisGraph module has reached end-of-life](https://redis.com/blog/redisgraph-eol/) and is completely unavailable in RHEL 9.
+
+#### Query results might include lazily expired hash key fields
+
+If one or more fields of a hash key expire after an `FT.SEARCH` or `FT.AGGREGATE` query begins, Redis does not account for these lazily expired fields. As a result, expired fields might still be included in the query results, leading to potentially incorrect or inconsistent results.

content/operate/rs/release-notes/rs-7-8-releases/rs-7-8-2-34.md

@@ -423,6 +423,10 @@ The following legacy UI features are not yet available in the new Cluster Manage
 
 You cannot upgrade from a prior RHEL version to RHEL 9 if the Redis Software cluster contains a RedisGraph module, even if unused by any database. The [RedisGraph module has reached End-of-Life](https://redis.com/blog/redisgraph-eol/) and is completely unavailable in RHEL 9.
 
+#### Query results might include lazily expired hash key fields
+
+If one or more fields of a hash key expire after an `FT.SEARCH` or `FT.AGGREGATE` query begins, Redis does not account for these lazily expired fields. As a result, expired fields might still be included in the query results, leading to potentially incorrect or inconsistent results.
+
 ## Security
 
 #### Open source Redis security fixes compatibility

content/operate/rs/release-notes/rs-7-8-releases/rs-7-8-2-60.md

@@ -117,6 +117,10 @@ The following legacy UI features are not yet available in the new Cluster Manage
 
 You cannot upgrade from a prior RHEL version to RHEL 9 if the Redis Software cluster contains a RedisGraph module, even if unused by any database. The [RedisGraph module has reached End-of-Life](https://redis.com/blog/redisgraph-eol/) and is completely unavailable in RHEL 9.
 
+#### Query results might include lazily expired hash key fields
+
+If one or more fields of a hash key expire after an `FT.SEARCH` or `FT.AGGREGATE` query begins, Redis does not account for these lazily expired fields. As a result, expired fields might still be included in the query results, leading to potentially incorrect or inconsistent results.
+
 ## Security
 
 #### Open source Redis security fixes compatibility