fix(index): restrict number of prefix values that can be simultaneously.

...queried to 1000 (ES defaults to 1024, there is extra room for other
clauses before ES would respond with an error)

commons/com.b2international.index/src/com/b2international/index/query/PrefixPredicate.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2021 B2i Healthcare Pte Ltd, http://b2i.sg
+ * Copyright 2011-2022 B2i Healthcare Pte Ltd, http://b2i.sg
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,13 +17,22 @@
 
 import java.util.stream.Collectors;
 
+import org.elasticsearch.common.util.iterable.Iterables;
+
+import com.b2international.commons.exceptions.BadRequestException;
+
 /**
  * @since 5.0
  */
 public final class PrefixPredicate extends SetPredicate<String> {
 
 	PrefixPredicate(String field, Iterable<String> arguments) {
 		super(field, arguments);
+		final long numberOfTerms = Iterables.size(arguments);
+		// XXX the usual maxClauseCount default value in ES is 1024, so allow room for other clauses before responding with an error to the caller 
+		if (numberOfTerms > 1000) {
+			throw new BadRequestException("Too may ('%s') prefix query clauses supplied for '%s' field.", numberOfTerms, field);
+		}
 	}
 
 	@Override