A company uses Amazon OpenSearch Service (Amazon Elasticsearch Service) to store and analyze its website clickstream data. The company ingests 1 TB of data daily using Amazon Kinesis Data Firehose and stores one day's worth of data in an Amazon OpenSearch Service (Amazon Elasticsearch Service) cluster.
The company has very slow query performance on the Amazon OpenSearch Service (Amazon Elasticsearch Service) index and occasionally sees errors from Kinesis Data Firehose when attempting to write to the index.
The Amazon OpenSearch Service (Amazon Elasticsearch Service) cluster has 10 nodes running a single index and 3 dedicated master nodes. Each data node has 1.5 TB of Amazon EBS storage attached and the cluster is configured with 1,000 shards. Occasionally, JVMMemoryPressure errors are found in the cluster logs.
Which solution will improve the performance of Amazon OpenSearch Service (Amazon Elasticsearch Service)?

A. Increase the memory of the Amazon OpenSearch Service (Amazon Elasticsearch Service) master nodes.
B. Decrease the number of Amazon OpenSearch Service (Amazon Elasticsearch Service) data nodes.
C. Decrease the number of Amazon OpenSearch Service (Amazon Elasticsearch Service) shards for the index.
D. Increase the number of Amazon OpenSearch Service (Amazon Elasticsearch Service) shards for the index.