Using add/remove when searching multiple indices with elasticsearch
The elasticsearch documentation on searching multiple indices states: Most APIs that refer to an index parameter support execution across multiple indices, using simple test1,test2,test3 notation (or _all for all indices). It also support wildcards, for example: test* or *test or te*t or *test*, and the ability to "add" (+) and "remove" (-), for example: +test*,-test3. If I understand this correctly, "-" in front of an index means that this particular index will be excluded. However, I'm not sure I understand the "+". Can it be interpreted as "must be included"? What would be the difference between +test*,-test3 and test*,-test3?
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