Typo

Author: nik9000

x-pack/plugin/esql-core/src/main/java/org/elasticsearch/xpack/esql/core/expression/UnresolvedAttribute.java

@@ -24,7 +24,7 @@
  * tree and then resolve them into other {@link Attribute} subclasses during
  * analysis.
  * <p>
- *     For example, ff they reference the data directly from lucene they'll be
+ *     For example, if they reference the data directly from lucene they'll be
  *     {@link FieldAttribute}s. If they reference the results of another calculation
  *     they will be {@link ReferenceAttribute}s.
  * </p>