Remove books.es entries from .gitignore

Author: mridula-s109

.gitignore

@@ -71,6 +71,4 @@ checkstyle_ide.xml
 x-pack/plugin/esql/src/main/generated-src/generated/
 
 # JEnv
-.java-version
-x-pack/plugin/search-business-rules/src/main/java/org/elasticsearch/xpack/searchbusinessrules/retriever/books.es
-x-pack/plugin/search-business-rules/src/main/java/org/elasticsearch/xpack/searchbusinessrules/retriever/books.es
+.java-version