Add index creation statements to MongoDB DDL script

The schema-mongodb.jsonl file was missing the index creation
statements that are already defined in schema-mongodb.js. This
adds the equivalent createIndexes commands for BATCH_JOB_INSTANCE,
BATCH_JOB_EXECUTION, and BATCH_STEP_EXECUTION collections.

Closes #5277

Signed-off-by: Meyonsoo Kim <digle117@gmail.com>

Author: PreAgile

spring-batch-core/src/main/resources/org/springframework/batch/core/schema-mongodb.jsonl

@@ -5,3 +5,6 @@
 {insert: "BATCH_SEQUENCES", documents: [ { _id: 'BATCH_JOB_INSTANCE_SEQ', count: NumberLong(0) } ]}
 {insert: "BATCH_SEQUENCES", documents: [ { _id: 'BATCH_JOB_EXECUTION_SEQ', count: NumberLong(0) } ]}
 {insert: "BATCH_SEQUENCES", documents: [ { _id: 'BATCH_STEP_EXECUTION_SEQ', count: NumberLong(0) } ]}
+{createIndexes: "BATCH_JOB_INSTANCE", indexes: [{key: {jobName: 1}, name: "job_name_idx"}, {key: {jobName: 1, jobKey: 1}, name: "job_name_key_idx"}, {key: {jobInstanceId: -1}, name: "job_instance_idx"}]}
+{createIndexes: "BATCH_JOB_EXECUTION", indexes: [{key: {jobInstanceId: 1}, name: "job_instance_idx"}, {key: {jobInstanceId: 1, status: 1}, name: "job_instance_status_idx"}]}
+{createIndexes: "BATCH_STEP_EXECUTION", indexes: [{key: {stepExecutionId: 1}, name: "step_execution_idx"}]}