MOD-7009: Search and Query - Empty indexing

content/commands/ft.create/index.md

@@ -118,6 +118,10 @@ arguments:
     optional: true
     token: WITHSUFFIXTRIE
     type: pure-token
+  - name: isempty
+    optional: true
+    token: ISEMPTY
+    type: pure-token
   - arguments:
     - name: sortable
       token: SORTABLE
@@ -258,6 +262,8 @@ after the SCHEMA keyword, declares which fields to index:
   - `CASESENSITIVE` for `TAG` attributes, keeps the original letter cases of the tags. If not specified, the characters are converted to lowercase.
 
   - `WITHSUFFIXTRIE` for `TEXT` and `TAG` attributes, keeps a suffix trie with all terms which match the suffix. It is used to optimize `contains` (*foo*) and `suffix` (*foo) queries. Otherwise, a brute-force search on the trie is performed. If suffix trie exists for some fields, these queries will be disabled for other fields.
+
+  - `ISEMPTY` for `TEXT` and `TAG` attributes, allows you to index and search for empty strings. By default, empty strings are not indexed.
 </details>
 
 ## Optional arguments

content/develop/interact/search-and-query/query/combined.md

@@ -144,4 +144,11 @@ Here is an example:
 FT.SEARCH idx:bikes_vss "(@price:[500 1000] @condition:{new})=>[KNN 3 @vector $query_vector]" PARAMS 2 "query_vector" "Z\xf8\x15:\xf23\xa1\xbfZ\x1dI>\r\xca9..." DIALECT 2
 ```
 
-The [vector search article]({{< relref "/develop/interact/search-and-query/query/vector-search" >}}) provides further details about vector queries in general.
+The [vector search article]({{< relref "/develop/interact/search-and-query/query/vector-search" >}}) provides further details about vector queries in general.
+
+## Empty values
+You can use the simple `isempty(@field)` to query for fields containing empty values (i.e., empty strings for TEXT and TAG fields).
+
+```
+FT.SEARCH idx:bikes "isempty(@description) | @description:(kids | small)"
+```