From Elasticsearch

**Table 1** Parameter description
Type	Parameter	Description	Mandatory	Example Value
Basic parameters	Index	It is similar to the schema or name of a relational database. Multiple indexes for entire DB migration are separated by commas (,). You can enter index aliases. You can also enter an expression containing wildcard characters, for example, asterisks (). If you select multiple indexes, their structure must be the same. This parameter can be configured as a macro variable of date and time and a path name can contain multiple macro variables. When the macro variable of date and time works with a scheduled job, the incremental data can be synchronized periodically. For details, see Incremental Synchronization Using the Macro Variables of Date and Time. NOTE: If you have configured a macro variable of date and time and schedule a CDM job through DataArts Studio DataArts Factory, the system replaces the macro variable of date and time with (Planned start time of the data development job* – Offset) rather than (Actual start time of the CDM job – Offset).	Yes	index_sample
Basic parameters	Type	It is similar to the schema or name of a relational database. Multiple indexes for entire DB migration are separated by commas (,). You can enter index aliases. You can also enter an expression containing wildcard characters, for example, asterisks (*). If you select multiple indexes, their structure must be the same.	Yes	type_example
Advanced attributes	Split Nested Field	Whether to split the JSON content of nested fields, for example, splitting a:{ b:{ c:1, d:{ e:2, f:3 } } } into [a.b.c], [a.b.d.e], and [a.b.d.f].	No	Yes
	Filter Conditions	Condition used to filter source data. The q syntax of Elasticsearch is used.	No	last_name:Smith
	Meta-field Extraction	Whether to extract meta-fields from the index. Currently, only _index, _type, _id, and _score are supported. Examples: _index, _type, _id, and _score	No	_index
	Page Size	Number of records displayed on each page	No	1000
	ScrollId Time Out	ScrollId timeout duration, which is five minutes by default.	No	5
	Retries	Number of retries upon a request failure. The maximum number of retries is 10.	No	3