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-rw-r--r--src/mongo/db/fts/fts_element_iterator.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/mongo/db/fts/fts_element_iterator.cpp b/src/mongo/db/fts/fts_element_iterator.cpp
index 689964f58d6..87c34fabba4 100644
--- a/src/mongo/db/fts/fts_element_iterator.cpp
+++ b/src/mongo/db/fts/fts_element_iterator.cpp
@@ -109,6 +109,11 @@ FTSIteratorValue FTSElementIterator::advance() {
continue;
}
+ // SERVER-78238: fields whose name contains a dot or starts with a '$' are not indexable.
+ if (fieldName.find_first_of('.') != string::npos || fieldName.find_first_of('$') == 0) {
+ continue;
+ }
+
// Compose the dotted name of the current field:
// 1. parent path empty (top level): use the current field name
// 2. parent path non-empty and obj is an array: use the parent path