Briefly, this error occurs when a percolate query is attempted on an Elasticsearch index that doesn’t have a mapping type. Percolate queries are used to test if a document matches the conditions of a query. To resolve this issue, you can either create a mapping type for the index or use a different index that already has a mapping type. Alternatively, you can use a match_all query instead of a percolate query if you simply want to retrieve all documents from the index.
This guide will help you check for common problems that cause the log ” [percolate] queries cannot be executed when ‘ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: percolator.
Log Context
Log “[percolate] queries cannot be executed when ‘” class name is PercolateQueryBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} @Override
protected Query doToQuery(SearchExecutionContext context) throws IOException {
if (context.allowExpensiveQueries() == false) {
throw new ElasticsearchException("[percolate] queries cannot be executed when '" +
ALLOW_EXPENSIVE_QUERIES.getKey() + "' is set to false.");
} // Call nowInMillis() so that this query becomes un-cacheable since we
// can't be sure that it doesn't use now or scripts
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