@raj1209 According to OpenSearch documentation indices.query.bool.max_clause_count: has value 4096 assigned by default.
Searching all eligible fields could be a resource-intensive operation. The indices.query.bool.max_clause_count search setting defines the maximum value for the product of the number of fields and the number of terms that can be queried at one time. The default value for indices.query.bool.max_clause_count is 4,096.
However, in the code SearchModule.java the default is set to 1024
As per documentation, increasing the max value of that setting would impact the search performance.