How can I find pairs of vertices with edges in both directions between them and filter the results based on a specific vertex property, such as age, using GraphFrames motifs in Databricks?
To find pairs of vertices with edges in both directions between them and filter the results based on a specific vertex property, such as age, using GraphFrames motifs in Databricks, you can follow these steps:

1. Use the `find` method on a GraphFrame object to search for motifs. In this case, you want to find pairs of vertices with edges in both directions, so you can use the following motif: `"(a)-[e]->(b); (b)-[e2]->(a)"`.
2. The `find` method returns a DataFrame, which you can filter using the `filter` method. To filter the results based on a specific vertex property, such as age, you can use a filter expression like `"b.age > 30"`, where `b` is the motif key for the second vertex in the pair.

Here's an example code snippet that demonstrates these steps:
```python
# Search for pairs of vertices with edges in both directions between them
motifs = g.find("(a)-[e]->(b); (b)-[e2]->(a)")

# Filter the results based on a specific vertex property, such as age
filtered = motifs.filter("b.age > 30")

# Display the filtered results
display(filtered)
```
In this example, `g` is a GraphFrame object that represents the graph you want to analyze. The `display` function is a Databricks utility function that displays the contents of a DataFrame in a tabular format.