How lexicons work in MarkLogic?

How lexicons are different from indexes in Marklogic.

Please explain with example.

Copyright Notice：Content Author:「Dixit Singla」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/38811872/how-lexicons-work-in-marklogic

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